Oh! and when you die, people will find things in the oddest places years afterwards, because they never thought of that your stairs are actually a drawer...Oh, I want that... all the wall full of hidden doors and passages, cupboards filled with intersting things and what not... Oh, my this is such a grand idea. Secrets can be hidden in so many places. A good use of useless places.
A trick for hanging photo collections: Lay out your arrangement. Flip frames over. Lay waxed paper on top of frames. Mark hanger/nail spot on waxed paper. Flip waxed paper over and tape to wall, nail into wall where indicated. Tear down waxed paper. Hang photos.-- Found this ONE day after I spent HOURS hanging a "gallery wall"