The Hedgehog cake has long been a favorite in our household. My wife used to make it for the kids back in Germany, and even found a form pan for it.
The cake is baked and then sliced into 3rds, filling each layer with a creme cheese based frosting, then topping it with chocolate frosting and using almond slivers for the quills.
These are not unusual in Germany, and she has carried on the tradition here in the states.
Sorry for the quality of the pics...pictures of pictures, and they weren't good to begin with, but you get the idea.