Check out some mac+halloween related stuff from the web:
3D Desktop Zombies Screen Saver
Get this screen saver if you want to have zombies roaming around your desktop.
Macintosh Virus Discovered
A mac virus turns macs into killing machines! There's some cool stop motion animation in this video. And also some blood and violence. Awesome. :)
Monster Mac Throwpillows
Check out this monsterfied throwpillow versions of the finder icon.
Happy Halloween everyone! :)