When our son Reily turned 1 I was still at the very beginning of my baking adventure. I made him a small applesauce banana cake. For his second birthday I wanted to do something special. Reily loves Elmo so it was obvious to me what I had to do! I was very happy how this turned out. I printed out a photo of Elmo and put a piece of wax paper over it. Then I used a black piping gel to outline Elmo on the wax paper. When that was complete I just turned the paper over and pressed it lightly on to the top of the cake. After that I just filled in Elmo with colored buttercream. It took some time but it was so worth it!!!
Original source from : Elmo Cake Tutorial