Transformers - Bumblebee birthday cake. This is a chocolate vegan double layer cake made with buttercream icing. I cut a hole in the middle of the top layer cake. Inside the hole I crumbled up chocolate cake to look like dirt. I created a flare in the middle using posterboard. I then placed the Bumblebee Transformer inside to create a blasting out effect. I finished it with two chocolate stripes coming out from the flare using a brown icing tube.