If you are using Windows 7, you can download lots of FREE themes, Desktop gadgets and wallpapers from Microsoft official website.
Right-click on Desktop and select "Personalize". Now click on "Get more themes online" link:
It'll open following a webpage in your browser:
Windows 7 Beta: Personalize your PC
You can directly open the above site in your browser.
You'll see lots of themes available on that page:
Click on any theme which you want to download. It'll download a .themepack file. Double-click on the file and Windows will automatically install and apply it.
PS: The site is new and there will be lots of updates in coming days. So keep visiting the site.
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