My daughter was having her birthday party at Build-A-Bear so for the Build-A-Bear theme I made a 3D bear cake to look like the Build-A-Bear character (girl one). I used the Wilton 3D Bear Cake mold and followed the instructions that came with the cake as to the type of cake mix to use, etc. It worked really well.
Then just made the face look like the character with the icing. It was a huge success with the girls.