If putting holes in the wall was a game this shelf wouldn't net you any points. The image below is a very rough SketchUp concept drawing of a shelf I built. The concept of "clamping" shelving between the ceiling and floor isn't original to me, in fact I've see several variations of the idea; this is just my variation. The point of this method of mounting shelves is - you get the shelf without the holes in your wall, the concept also lends itself to being placed where there is no wall (stud) support.