My son's birthday is the week before Halloween...not that his cake choice would have been any different otherwise.
He asked for a zombie cake. He isn't a big fan on fondant (neither am I, honestly) which was perfect for this cake.
I just frosted a normal cake and put cookie crumbs on top for dirt.
Then I made a (half) zombie head and two hands out of fondant.
Then I made three hil-ar-ious tombstones, also out of fondant.
The final touch is the bones "underground".