There's more than one way to express your nerdy side. Why not throw them all at one cake?
My husband really wanted a sword in the stone cake, he didn't see it until the reception (we we're married at Disney World) and was very happy that he finally got to pretend to be King Arthur.
FOR THE SHIIIREEEEE!! Hmm... FOR NARNIAAAAA!
Oh wait: FOR CAMELOOOOOOTTTTT!! There we go.