One of the most beautiful things I've seen on the Web lately is something from ElectricSheep.org. The have created a truly amazing abstract art screen saver.

You can see a sample of the work here.

The way it works, is that you install the application (it works on a PC, Mac or Linux), and when your computer sleeps, it contacts other computers with the application and they join forces to make artwork. (Like Seti@Home or Folding@Home, but with art.)

Personally, I love the idea of my computer working on art projects in its down time. The results are simply mesmerizing, gorgeous and hypnotic. You'll be putting your computer to bed early just to watch what it does.