CosmicPainter is a drawing application with one special feature: the destination canvas is moving while you are drawing on it. As you will see, it allows you to create complex animated patterns very easily. Since the V2.0 it is also possible to draw on tiled images allowing the creation of circular textures very easily. Be careful, it is a very addictive painting program.
Mac OS X 10.2,
Mac OS X 10.3