If you have quarter tile placement on, you can place the Space Columns inside the walls and they stick out on either side, so you can make designs or support beams or something. (I'd recommend it on a back exterior wall because the columns are visible in wall cutaways.)

I haven't really played around with the designs much since I just discovered it last night, but the black on brick has an industrial look and I tried colors on white too.

(I also have a single story version of the columns and that works too)