I made a Zombie cake this weekend! I had a blast making this one. The cake itself was a half sheet size. I used dark chocolate cake filled with chocolate fudge, and frosted with silky smooth chocolate italian meringue .
Halloween lover and Instructable user SemadarG posted this tutorial for how to make your own zombie mouth cupcakes. The entirety of the mouth and gums and teeth are molded by hand out of fondant though, so if you don't.