Magnetic picture frame
Have you ever dealed with hanging picture frames on the walls? I bet you have. You need to do your measurments, make sure it is straight and then screw a hole in the wall to hang the frame. How about creating picture frames with magnets at the back that can be attached to the wall without any hassle? When you want to take them off the wall, you will have no scars on the wall. But we need a specific wall paper that has fine lines of iron in it. I think it is a great idea for builders which build buildings for rent and they do not want to deal with fixing and painting the wall after each tenant leaves.