I have my larger rulers hung on my peg board using a belt hanger - it's a metal circle with a capped opening to slide them on to it. Then for my smaller rulers, I used a sloted polished board I found at Goodwill - intended for dishware display in cabinets. These are then stored on my cutting table to make them handy.
One of my friends uses a file folder stand for rulers and Go Cutter dies.