I am a children's librarian, and recently held a "cake decorating" workshop at the library, where the kids got to decorate one of four "cupcake styles". Over 150 kids showed up. I chose simple designs that even the younger kids could handle. We used chocolate icing for the base. Ground-up chocolate cookies were sprinkled on top. Using a straw, 2 holes were poked into the cupcake and gummy worms inserted.