3D Desktop Zombies Screen Saver for Mac

From Useless Creations:

Celebrate Halloween in style. Watch as the undead come back to life and roam your desktop, fighting, crawling, and leaving messy footprints, blood and gore, all over the screen you were just working on, or any other image. Features Include: * A Zombie is not just for Halloween. Sure, we all love the undead, but they usually just get an outing at Halloween. So here's a screensaver that's nifty enuff to be used all year round. * Blood, gore, and fun. As the zombies roam around, they fight, eat each other, and leave messy foot and hand prints all over the place. But if you don't like the sight of blood, you can change the settings so the blood is less creepy. Or gone altogether. * Use any image you like. The zombie 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.