I'm envisioning a "soft-wall" darkroom. Use two existing walls (a corner!) and use a black canvas type material from ceiling to floor. It'll probably need to be layered and will have to be sealed light-tight to the ceiling. It'll have to be situated near plumbing too. Just an idea! I've never tried it. I'll let it marinade in my head for a while longer and see what I come up with :-)
"Emotion or feeling is really the only thing about pictures I find interesting. Beyond that it is just a trick."
- Christopher Anderson, Magnum Photog