When this homeowner discovered 100 years worth of linoleum and sailcloth under the kitchen floor, he salvaged enough to cover one stair with each layer. This a fun idea for basement stairs. I could do this with the wallpaper!
Levitate Architects used a staircase to a loft-like bedroom to create an enormous amount of book storage space. Even though the staircase isn’t very compact but could accomodate so many books that it would save some space anyway.