If you want to change a little the look of your Linux boxes, or if you are obligated to work with Windows at work but like to have a little of the Linux look :), try this site, where you will find nice wallpapers about GNOME, KDE, XFCE and others themes.

Also you will find themes for Beryl, icons, and much more, but those seem not to be available yet, so we will have to wait a little.

This site is called, Art4Linux