I was just trying to make a basic spiral staircase as practice for modelling.
I ended up with this slightly complex scene, baked in Cycles Bake build of 2.70. I attempted to bake the emission, but it didn't turn out as well as the Ambient Occlusion baking, so I kept that. I think it looks better like that anyway.
This scene seems like it'd be good for a game basis, maybe. Kind of an older, early 1900's style, so maybe old rusted textures and flickering lights.
I really hope you enjoy this, and find it useful. This is my favorite of all my models so far, I really love how it looks with the AO. It'd mean a lot to me if it gets used somewhere. Since I've already separated the stairs from the walls, it shouldn't be tough.
I'd like you to credit me if you use it, but I won't make you.