This was a cake I did for a 4 year old. He is really into cars and I thought it would be neat to make a monster truck cake so he could play with then after they were off the cake. I was really happy on how the "dirt" turned out. I used crushed oreos and also chocolate milk mix. This was a 8" round cake (double layered) then I used two cupcake tops for monster trucks to be climbing over.