I've only completed three corridor tiles. Two are right-angle turns and one is a straight hallway. Because of the foam walls, I painted them with latex gray and when back over with a wash (rather than starting with black spray paint). Unfortunately it's really hard to get the colors to match when putting the paint down in reverse like this. But otherwise I like the effect.
The right-angle corridors are designed to fit in one corner of a room square. All of them are made with ½ inch wide by 1 inch high Styrofoam walls -- just enough to mark where the walls are, but not get in the way.