Debi,

I have a great book that you might check into. It's called Dinosaur Cakes By Jacqui Hine. It was published in 1991 by Merehurst Limited in London. The ISBN for it is 1-85391-177-1. It has wonderful pictures and directions to make really neat cakes that can be dinosaurs or Dragons. Most of them have been "frosted" with gumpaste for a 3D effect, with scales, spikes, and teeth, too!

One in particular uses a tall rectangle (you could use a loaf pan) with a head (two cake pieces about 1 1/2 inches high, the same width and length of half the loaf, on top of each other with a wedge between them to make the mouth look open) pieces in front and on the sides for arms and legs, and a tail from pieces decending in size. For dry ice, I would omit the wedge of cake betweeen the head pieces and use cardboard instead; behind it, I would place a small plastic tray,(or cut down a disposable plastic cup) about 3/4 of an inch high and place your dry ice with warm water. On the top piece of the head, insert two short drinking straws for the nostrils that go through the top layer, just above where the dry ice will go.

Good Luck! It sounds like a fun cake to make!