Cake Wrecks, which shows good icing ideas gone bad, and great execution by the pros, has a Halloween collection to laugh at or emulate. You can start at the main link and keep going through some non-Halloween posts, or click the links on the photos below to go to just the spooky-cake posts.

From Halloween Heckling. Could this be a Flying Spaghetti Monster?

Halloween "Huh?"s. Can a cookie be male?

Autumn Terrors. Surely you could do better than this.

Sunday Sweets: Halloween. Now that's impressive, especially since it seems to defy the laws of cake physics.