To get the painterly collage look, I rolled out homemade marshmallow fondant, treated it like a canvas and loaded up my paintbrush with a rainbow of Wilton gel colors, thinned slightly with vanilla vodka. The green canvas was huge and featured a gradient of green, blue-green, and yellow-green. I then cut out strips and arranged them on my caterpillar. The body of the caterpillar is made of lemon pound cake which I'd baked in a bundt pan. I cut the ring of cake into segments and rearranged them to get this shape. The segments were glued together and smoothed out with a generous amount of American butter cream frosting. Since Carle uses collage in his work, so did I. I think it did emulate the effect fairly well. I did the same for all the little treats that the caterpillar snacked on through the week.
My former colleagues were surprised to learn that this was a homemade cake, so I suppose it speaks well of the job I did. One gal brought her little boy and he was absolutely fascinated with the cake and the little cupcakes. I was particularly pleased by his sense of wonder. I think that is always what I hope for when I create a cake. It's really the best feeling ever.