I’m always on the lookout for a good screen saver. Linux in general has tons of those, but I “stumbled upon” one I thought was amazing. It is called Electric Sheep, and it works for Windows, Macs, and Linux. A small description from their site:

Electric Sheep is a free, open source screen saver run by thousands of people all over the world. It can be installed on any ordinary PC or Mac. When these computers “sleep”, the screen saver comes on and the 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.

And as usual, it is open source and free..