3D Desktop Kitty Cats Screen Saver for Mac

From Useless Creations:

Watch as the screen you were just working on is turned into a 3D playground for real 3D kitty cats. They run around playing with cat toys and leaving footprints all over your desktop, or any other image you like. Features Include: * Dozens of cute, cartoonish, truly 3D, pussy cats. The full version includes 3 different cat models, with 13 colours/fur patterns each. That's over 30 different cats for you to watch make your desktop that little bit cuter. * All the fun of a kitten, without the smell of cat food. As the kitty cats wander about your screen they leave footprints. They also scratch, sleep, sniff, play with balls of wool or rubber mice, and more. Meow. * Use any image you like. The kittens will walk around the screen you were just working on, or you can set them to walk about your desktop background, wallpaper, or any other image you like.