I was playing around in OSX, looking for some cool things to do in my non-Windows installation, and I stumbled upon Quartz Desktop. It's amazing. It lets you use any quartz composition as a desktop background. For those of you who dont know, a Quartz Composition is a visual effects file that uses user-written visuals to make a sick display of graphics. There are hundreds of cool, unique compositions out there to choose from. If anyone can explain it better, go ahead. I'll attach a .mov (QuickTime) preview file so you can see the sick effects for yourself. EDIT: I just watched the movie, and the resolution sucks (oh well, small file size...), so the graphics won't be crisp, but you'll get the idea.