Christmas trees made from cardboard cutouts--cut shapes from cardboard. Use Mod Podge to cover with Lilly Pulitzer wrapping paper for colorful trees! The Pelican Girls sees a whole forest of Lilly trees!
Geometric patterns painted on wooden storage crates--I bet you could use wall decals to make the design too if you sealed the wood first. (maybe for one box-like the chocolate display- to bring in the devil girls)