These would probably work if he were turning 5.
Who wouldn't want a Gromitcake?
But I'm thinking, as much as I enjoy spending time in the kitchen creating and producing, I've never been very talented with the whole frosting-baking-sugar-fantastic world.
'Fraid my cakes are prolly gonna come out like these:
A beautiful study of spinach-speckled frosting on a over-cooked wad of cake.