I made this Wall-E cake for my 5 year old son. It was very challenging, but I refused to give up. Body of cake is red velvet with buttercream filling (4 layers). The head, arms and track are rice krispie treats. Everything is covered in fondant. For the dirt I used some old dark brown sugar I had... worked well because it was hard and made great 'pebbles' when I crumbled it. Thanks for looking!