Two suggestions: First, you could just make a sheet cake and pipe the design from a good picture of Curious George onto an iced cake. Second, use a picture as a stencil to cut the cake to shape, and then decorate it.
The most simple way to make a curious-george cake:bake a dome-shaped cake using a barbie-dress cake pan. Frost it yellow and make a black strip using ribbon. Create a curious george face from fondant or gumpaste or you can purchase a toy. Make him peek out from under the hat.
