If you’re testing the beta version of Windows 7, you can personalize with new themes created by ithinkdiff with a variety of visual styles to choose from. More than 20 themes for Windows 7, with the notable Apple, Earth, Grass, Simpsons, Leopard, Snake, among others.
Click on the image to go to the download page
Remember that these visual styles are unique and exclusive personal use only ,these themes only work well on Windows 7.
To install, just download and double click to open them in the Personalize options
Download : Windows 7 Themes