Thank you all for the ceiling decorating suggestions!
I have decided to paint the ceiling blue, add some fluffy white clouds and hang origami paper cranes, butterflies and dragonflies, in varying sizes and colors, from it. I think I'll also try to incorporate foil paper on the undersides to make them even more visually appealing. We have a small fan that I'll attach to the shelves in his room to make them fly about.
I'm really jazzed about this and will post photos when it is done.
A recent shot of Owen in his new hat.