Not original with me, but this works great. Take an old shallow drawer (or just make a shallow box) and cut slots at a 45º angle on the opposite sides. Space the slots evenly at about 1.5" apart. Hang the box on the wall above your cutting area with the slots angled up, of course. Then simply slide the rulers in. The long rulers will probably fit across using a slot on each side of the drawer and the shorter ones may or may not fit across but are still safely up and out of the way. This doesn't work for the big square up rulers, but they can be hung on the wall below the slotted box. I recommend a "dry fit" before the permanent placement.
Kay in NJ