Construction and Tonka cake I made for my ds's Birthday. DS loves construction trucks. The bottom Tonka layer is yellow cake with buttercream and MMF accents, the middle Rock layer is half chocolate, half yellow with buttercream and wrapped in MMF 'rocks', which I got the idea from the bottom layer of pidge's snowboarding and construction cake, and the top layer is chocolate with buttercream grass, crushed Nilla wafers for the sand, and chocolate cake for the dirt, and candy rocks for the rocks.