If your computer’s got a decent internet connection and some graphical balls, give this thing a try- its a community-created screensaver client. The sceensavers are beautiful, and if you like one or dislike one, you can vote them up or down using the arrow keys on your keyboard-so the best voted ones get delivered to the most people. Pretty cool stuff.
On a semirelated note, I just finished the Philip K Dick book which this screensaver borrows it’s name from- and it was good.