My little guy's birthday party was yesterday. I created a cake for him based on Toy Story, with Andy's room as the theme. If you've never seen Toy Story, this cake will look like a random, over-loaded hodgepodge of mismatched toys. But if you've seen any of the three movies, you'll understand just how essential the characters are.
My design isn't original (you can find other similar cakes online), but the execution and construction was unique.
The cake is two layers of 9x13 sheet cake, iced with buttercream (chocolate filling), and then covered in fondant. Most folks only use a crumb coat under fondant, but my family doesn't care much for how fondant tastes, so I ice with buttercream or cream cheese icing. That way my husband can just peel the fondant right off. It's the best of both worlds: a cake with the yumminess of buttercream or cream cheese icing combined with the design flexibility and wonders of fondant.
Aside from the toys, which were part of my son's birthday presents, every part of this cake's structure is edible...except a few strategically-placed toothpicks, used as anchors. That's one of the true challenges in cake decorating.
I constructed the headboard from a sheet of matzah, large pretzel sticks and gummy candy balls, all rolled in a fondant/gumpaste mixture. The pillow is a small sliver of cake, again rolled in fondant. The sheets, blanket, rug, and letters are also fondant.