A cool feature of Google Nexus One Android phone is live wallpapers or moving backgrounds. This is similar to Windows DreamScene feature (available in Vista Ultimate edition), and you can add this moving background in your Windows 7 also.
If you aren’t familiar with Google Nexus One Live Wallpaper, watch this YouTube video. If you like it, follow as given below to enable this in Windows 7.
Download Windows 7 DreamScene Activator from here. It is a free, tiny portable tool. Extract it and run it as administrator (Right click and select Run as administrator). Click ‘Enable DreamScene’ to activate DreamScene in Win 7 and close the program.
here and unzip it. Right click on the N1 Dream Scene HD (.MPG) file and select Set as desktop background. That’s all. (Via)