J+B, I think your wall is pretty good. Of course there's room for all kinds of creativity and improvement, (aren't a lot of things that way) but cmon people, it's a quick build to show off an idea: a doodle. Don't freak out and cry over Doodles. They spawn creativity:
Here's an interesting idea I picked up from a role-playing forum. Have a random door that leads to a random side room covered with several random chains and stick a random unspeakably horrid monstrous murder machine on the other side.