For many people, the only reason worth upgrading to Vista if for the look since the functionality and basic framework really don't differ that much from XP.

If you think the same way, then you'll be more than happy with Vista Transformation Pack. Once installed, the program makes superficial changes to XP that give it the Vista look. The main changes are that it "Vistarises" your start-up screen, cursors, sounds, screen-savers, tool bars, clock, etc. The transparent effect in Vista is hard to emulate on XP machines but by combining with Windows Blinds, Vista Transofrmation Pack does a surprisingly impressive job. Be warned however that some users have complained the program changes driver DLLs in XP which make it difficult to remove, or at least, it leaves problems behind when you do so.

To be fair to them, the developers advise you to view their user discussion board before installing to be warned of any potential problems as they readily admit that they are not aware of all the bugs it may cause. Note that if you're simply updating Vista Transformation Pack, there's no need to uninstall the original - just install the patch. They've also added a user selection feature whereby if you log onto your PC as a different user, you can select whether you want to transform your XP desktop to Vista.

This is probably one of the best transformation packs out there although be warned that it's likely that you'll suffer conflicts with programs from time to time, and may have problems with XP when it's uninstalled.

Download Vista Transformation Pack 8.01 in Softonic

I'm about to convert to Mac myself but if I wasn't, I would definitely use Mac OSX Tiger Theme 1.3 to at least feel like I'd converted.

The skins feature the classic Aqua and Graphite schemes and the newly introduced Platinum scheme which you can find in the System Preferences and Mail programs in Mac OS X 10.4. They've also included Brushed with over 20 substyles added for good measure. The Apple menu is unfortunately, not an exact copy of the original but it's pretty close. It's basically a stripped down Start Menu that has been made to look like the Apple menu in Mac OS X. In addition, there are also left and right handed titlebar buttons for those that want their PC to look like a Mac but at the same time keep their right handed Windows buttons. The look and feel is remarkably Apple although Windows keeps creeping through especially with it's annoying sounds sometimes to spoil the illusion. If you have any widgets installed, you may also find that they don't show with this installed.

A great skin for those that either can't afford a Mac or those that simply prefer the elegant Mac look and style.

Download Mac OS X Theme 1.3 in Softonic

Creating the look of Vista on XP has become something of a cottage industry, mainly because most people know that Vista IS XP just with a few fancy skins on.

VistaXP v2 VS is an excellent Vista skin for XP which gives you all the benefits of the Vista look, without paying hundreds of dollars for the upgrade. The package is inspired by the original Windows Vista look (Codename Longhorn) and the package contains two Visual Styles - Black and Silver. The Start menu (which incidentally I hate in Vista) is very realistic and manages to compact all your programs into a shorter Star menu bar than you usually get with XP. There are only 3 different fonts to choose from which surely could have been increased although fonts are not the most important thing when it comes to the look and feel of your operating system. However, it does feature the original Segoe UI font although the wallpaper is limited to the now rather dated Vista Beta 1 wallpaper. It's a shame the developer chose not to include any widgets in this pack as that would really have made it much more realistic but combined with another Vista skin pack, this could make a really impressive Vista look.

A very good Vista skin for XP although it lacks realism in some aspects but for free, you can't complain.

Download VistaXP v2 VS in Softonic

If you’re yearning to experience the dapper new Windows Vista interface but don’t fancy splashing out for an upgrade yet, then VistaXP is the perfect antidote. There’s no doubt that the XP styling is well past its sell-by date and this Visual Style provides a classy alternative modelled on the new OS.

Although VistaXP takes a bit longer to apply than most Visual Styles, you’re rewarded with a very accurate recreation of Vista’s window bars, taskbar and Start Menu. The style applies a sleek gun metal shell to your windows and program icons in the taskbar glow a brilliant deep blue when rolled over. Likewise the Start button turns a gorgeous green when you hover over it.

Unfortunately the visual style doesn’t include a Vista background or any of the innovative new desktop features of Microsoft’s latest operating system. However, by installing the Vista wallpaper and Vista Sidebar, you can get a true feel for the OS. Of course, you won’t get access to the fancy new file management tools, but it’s sure to raise a few eyebrows when your friends and colleagues pass your computer.

Download VistaXP V3 WB 3.1 in Softonic

Some time ago Microsoft launched Royale Theme for Windows XP, a slick, elegant blueish theme that many people adopted immediately. A new Royale theme appeared after that, this time in a very elegant black. However, this dark Royale was apparently not finished and you could tell it clearly needed some polishing. The same happened with the Zune theme created by Microsoft to celebrate the launch of their MP3 player. It seemed someone had leaked them without having tested them properly.

Bearing that in mind, an independent designer has finished the job on his own and now presents Royale Remixed, a theme for Windows XP that fixes all the bugs in the Noir and Zune themes and adds everything the original themes lacked.

Royale Remixed will not only change your desktop wallpaper and windows appearance, but it will also replace your system icons, mouse cursors and system sounds with new files. The result looks like a completely new system with a really attractive design.

That said, note that Royale Remixed is not as easy to install as it seems. If you have problems installing it, it's probably because you need to patch a DLL file (see Notes). I had this issue and it took me some time and a few Google queries to find out what was happening. Also, if you want to customize the shutdown window to match the rest of the system, you'll have to modify another couple of DLL files. Fortunately, this process is very clearly explained in a TXT document included in the program's ZIP file.

Customize Windows XP with this shiny, elegant black design.

Download Royale Remixed Theme 1.47 in Softonic

Royale Noir is an almost exact copy of Royale except with a dark purplish tint. If Royale was day, Royale Noir is night. No doubt about it, this is a ‘dark’ theme. If you’re the sort of person who likes bright and vivid colors, stay away from this theme.

As W3bbo pointed out, there are quite definitely issues with this theme due to its incompleteness. The most obvious being, the “Start” button’s hover and active states are unchanged from Royale, inconsistent with the purple tint surrounding. However, there is even a color scheme for Office 2003 so it will not default to the blue Luna colors.

Looking at it from the big picture, Royale Noir is a welcomed alternative to the extremely small collection of verified-by-Microsoft XP themes. However being incomplete, it is not recommended for the general consumers. Enthusiasts are welcomed to try it to stand out from the crowd, but even still, you’ll feel right at home with the familiar Luna/Royale style.

Download Royale Noir XP theme in Softonic

Ubuntu XP is not a strange mixture of operating system, as you could tell from that name. It's a complete kit to transform Windows XP into Ubuntu – at least in its appearance.

The pack includes everything you need to give XP the Ubuntu look, from a new visual style (with several color variations) to mouse cursors, featuring also wallpapers, new logon and boot screens, skins for Firefox, icons and even a clone of Beryl, the 3D windows management system used by Ubuntu to change between applications.

The good thing about having a package with all these elements, categorized in several different folders, is that you can choose what to install and what to leave unchanged. The downside is that you have to do it step by step, and sometimes you even need a third-party application - like in the case of the new boot screen, which needs the Bootskin tool. This installation procedure can therefore be a bit complicated, as there's no documentation to explain how to apply the whole kit properly.

Give Windows the clear, colorful Ubuntu look with Ubuntu XP

Download Ubuntu XP 1.0 in Softonic

If you're considering moving to Linux but haven't made up your mind yet, ClearLooks can tip the scales in favour of the open source option. This Windows theme includes two new visual styles that resemble Linux Ubuntu's appearance, with new colors and a refreshed window style.

Simply run the msstyles file and you'll be able to choose the visual theme in Display settings. ClearLooks includes a couple of matching skins for Y'z Toolbar in case you use it, and also a cursor set that must be installed one by one in the Control Panel > Mouse configuration window. However, I missed having some wallpapers bundled in the package.

ClearLooks is a Linux-based visual style that enhances the appearance of your desktop.

Download ClearLooks 2.2 in Softonic

If you like the new graphical interface of Windows Vista, but prefer to continue with the friendliness of your XP, Transform XP to Vista is a good solution to get you going.

It's a simple package containing a desktop with the look of Vista and many of the applications you'll find in Vista Start Menu and Yahoo! Widgets. It's easy to install, you can choose the three main components of the package or any of them, and if you get tired of Transform XP to Vista, you can uninstall it with equal ease. The package also includes Yahoo widgets which is basically a collection of small and useful desktop assistants. This includes anything from a PC temperature gauge to mini games. The Vista Start Menu is modified not only in appearance but also in functionality. You'll find a few new tools on there that aren't in XP and it's basically a lot more accessible although some things, like "Communication Centre" have been renamed.

A cool little package that will save you a packet on Vista's hefty price tag but won't leave you with all the compatibility problems associated with it.

Download Transform XP to Vista 1.2 in Softonic

Ubuntu is by far the most popular Linux distribution these days, thanks to its eye-candy design and user-friendly environment that set this operating system far from the console-style, hacker-only image we all had of Linux some time ago.

But if you don't dare jump to the penguin side yet, don't worry: you can still enjoy Ubuntu's look and feel with this Windows visual theme. Smooth Ubuntu Human includes pretty much anything you need to make your Windows computer look like the Ubuntu operating system. Besides the graphic elements such as wallpapers, fonts, cursors and icons, you also get a special DLL patcher that enables you to use the theme even if it's not an official Windows visual theme.

The result is quite impressive and looks really nice, though I missed having a bit more of choice in wallpapers and theme colors. Also, I must say this theme is not as easy to install as other themes I've tried. For example, if you want to install icons you'll need to download and install a third-party application.

With Smooth Ubuntu Human you can get the Ubuntu look and feel on your Windows computer, though you'll need to go through several steps to obtain the complete package.

Download Smooth Ubuntu Human Theme 1.0 in Softonic

Ever get envious of your Mac-using friends and their swanky desktop interfaces? PanthFlux is a theme designed to emulate the look and feel of OS X (10.3). It is based on AquaFlux, which emulates the look of the other OS X releases.

Download PanthFlux in Softonic

Graphite Metal is based on Apple´s Aqua Graphite look and contains tons of elements with a toned-down Trans Metal and Panther GTK. Besides the usual wallpaper, the theme contains Graphite icons and logos that will make your desktop a much prettier place to be.

Download Graphite Metal - Default branch in Softonic

Even if you don't have Vista, the Inspirat Bricopack will make your PC look like it’s been fitted with Microsoft’s latest Operating System. Not limiting itself to one visual style, Universal Vista Inspirat is a bulky (483 MB) yet complete theme pack made up of wallpapers, icons and appearances that will give your PC a complete makeover.

We were impressed by this Vista theme pack. Not only do you get the sleek dark menu bar characteristic of Vista, but the theme also sets up a Mac-like dock where you can nest icons of your favourite applications. They even magnify when you roll over them. With the Ubericon feature you can get that magnifying touch for every item you double click. Y’s Shadow is another feature that separates Universal Vista Inspirat from other simple Vista Themes. This feature gives a cool drop shadow to your windows, which you can easily increase or decrease and even apply to your taskbar.

Universal Vista Inspirat ingeniously improves the feel of your XP menu yet we felt a little more sceptical about the cosmetic changes it applies to other Microsoft applications. Word and Outlook are given a fresher, whiter look, but we were unimpressed by how Windows Media Player appeared, with a dubious purplish hue replacing the default sleek dark feel.

Universal Vista Inspirat is an impressive theme pack filled with original features that definitely separates it from typical Vista themes. Despite a slightly lengthy installation process and bulky file size, this theme is probably the closest you’ll get to Vista without dishing out $200.

Download Universal Vista Inspirat BricoPack 2.1 in Softonic