I'm always looking for ways to give my kids an excuse to imagine - like most parents, I guess. My daughters room is right against a small unfinished storage closet with access from our bonus room / office. I would love to cut a hole into that (unused) closet with one of these guys sitting at the entrance. Put a small wireless webcam in there so I can keep an eye on them anywhere in the house... cause kids can get into all kinds of madness if left alone for too long. But I digress.
There are other ideas if you follow the link. Good inspiration if you want to build something like this yourself.