I made this bat cake for my twins' third birthday. This happened about a year and a half ago, though. Such a cake is very easy to make: its components are cut out of a round sponge cake and coated with chocolate cream. The eyes, ears and teeth were made of marzipan, although colored cream or candies can be used as well.
I found this great idea in Kids' Party Cakes. Maybe someone will find it useful, especially now, when Halloween is almost here :)