"Smoky Glass"

This is a tiling image (made with a pre-release version of Genetica*) that will repeat seamlessly with itself to create a beautiful flowing background.  Right click the above image and select Set as Background. Then, in your Windows Display Settings, set the background mode to "Tile."  This ensures the image will be repeated many times, not just once.

*  Genetica, an up-and-coming graphics application, will be an ideal tool for making repeating backgrounds, seamless textures, and game graphics.  To see a gallery of seamless textures made with this program, look here.