This is an awesome website called Electric Sheep
http://electricsheep.org/index.cgi?&menu=about I'm thinking about down loading the program. When the screen saver comes on, computers communicate with each other by the internet to share the work of creating morphing abstract animations known as "sheep". The result is a collective "android dream", an homage to Philip K. Dick's novel
Do Androids Dream of Electric Sheep?.
Anyone watching one of these computers may vote for their favorite animations using the keyboard. The more popular sheep live longer and reproduce according to a genetic algorithm with mutation and cross-over. Hence the flock evolves to please its global audience. You can also
design your own sheep and submit them to the gene pool.
My current screen saver is a slide show of nebulas (is that nebuli?) and space dust. It's totally awesome. It's like looking at god (in technicolor).
Here's one of space dust