in the dungeon behind the magic mirror,in the majestic packs house(winter wind tower), ,in the open cell, you can put down wall paper and flooring, however if you do, and then place down an object(i put down a train) the tracks turn invisible ad you can't pick it up unless you pick up all items in the entire house..also you can hang decorations on the back wall, but the two side walls you can't hang anything on.
