While this Elmo cake didn't turn out exactly as I had pictured in my mind, I was still pretty happy with the end result.
You need: 1. A triple recipe (approx) of rice krispies treats (marshmallows, butter and rice krispies) 2. 1 8x8 cardboard square and 1 8" round cardboard 3. straws 4. fondant in any color you choose 5. icing - I made a TON!!! I used 4 lbs of powdered sugar, but I also had some left over. You need red buttercream for Elmo, and black, orange and white, either in fondant or regular buttercream/other. 6. Optional - I also used a few toothpicks and a skinny bamboo skewer to hold Elmo together.
The bottom part that looks like a gift box is just 4 square 8x8 cakes (made from 2 box cakes). I stacked two layers with icing between, then put a cardboard square on top of that supported by straws pushed into the base and cut flush with the top of the cake. On top of that I layered the next 2 layers of cake, once again with icing between. Then I iced the whole thing and decorated with fondant.
Elmo is molded by hand out of cooled rice krispie treats. I made him the night before, using a bamboo skewer all the way through to pin his arms and body all together. I then wrapped him in plastic wrap and refrigerated him overnight to make him firm. I covered him with buttercream and used colored fondant for his eyes and nose. Black decorators icing was used for the inside of his mouth. I used a round cardboard piece beneath Elmo and more straws in the top of the box part of the cake to support him since he was pretty heavy.
I wouldn't recommend trying to put Elmo on top of the cake until you're ready to serve it - it's a very heavy cake and could fall or be crushed by it's own weight.