I decided to make myself a pretty moving background for my desktop.
This is pretty simple looping animation of a blueprint of a coin. Actually it kind of looks like it's from Mario...
I'm using VLC's set as wallpaper function to make it my background, this would probably also make a good screensaver though...
Rendered using Blender Internal and Freestyle.
Its pretty good. Do you have a tutorial on how the freestyle collections works?