Circus Nursery: The Big Top. I'm not this patient to paint like this, but how neat would it be to do something cool to the entire ceiling? I also like that it's not the typical red/yellow/blue circus color scheme.
Built-in bunk beds is a great idea to preserve space. The built-in book shelves also help to create more storage for toys, books and etc. The first step of the ladder has been eliminated in order to add under bed storage/trundle.
A bedroom is always a portion of the full home program. The interiors you pick for your youngster's room must make the room appear bigger, brighter and colorful. Your room states a lot about you, so take advantage of it!