Polka Dot Cake neat idea for the dessert table. I would do multicoloured polka dots inside but, decorate the outside to look more disturbing/halloweeny.
Checkerboard Birthday Cake - Eat Healthy Stockphoto My mom had a set of cake pans with separators that made a checkerboard cake. The batter had to be extra thick to keep it from running, but it turned out pretty. This way, however, is foolproof.