Not sure if Hunter is talking about the same thing, but the walkways from the Cities of Death terrain could be cut into 1x2 strips and used as stairs. Actually, I like that idea so much I'm storing it away for my own usage!
EDIT for spelling and relevant image of piece
You (possibly) couldn't use the ones with hatches in, but the others you could cut across the horizontal (which is the vertical as the image is displayed).