With the new release of Windows 7 on October 22, Microsoft also introduced many new themes. There are two main categories: Featured themes and International Themes. Some have made their appearance before, but many are new. See the following:

http://windows.microsoft.com/en-US/windows/downloads/personalize

Once you select the theme, you can save it locally or install it. After a few seconds it will automatically appear on your personalized theme collection, and it will appear on your desktop. The default time setting is 30 minutes.

These themes provide a variety of subjects, some cartoon based,  movie based, automobiles, and many countries.

Avatar	Bing’s Best	Happiness Factory	Ducati
Ferrari	Gears of War	Gears of War 2	Infiniti
Lugares Coloridos	Refresh Everything	Porsche	Zune Characters
Zune Elements	Zune Zodiac

Australia	Brazil	Canada	China
France	Germany	India	Italy
Japan	Korea	Mexico	Netherlands
Poland	Russia	South Africa	Spain
Taiwan	Turkey	United Kingdom	United States