A couple of handy ideas ... I use two knife magnet type wall holders for my scissors and anything else made of metal that can fit on them. I got both of the knife magnet holders at thrift stores for under a dollar. They've been a treasure for me. The other thing I have done is nailed a wooden yard stick to the wall near my cutting table and have hammered nails on it to hold all, or most, of my rulers. if you use fairly long nails, you'll be able to hang two or three rulers on each one. Don't forget to measure how much space there should be between the nails. My rulers are in many different widths.
Also, I use a wooden trivet that is square and has spaces between the pieces of wood that go across it to hold my square rulers upright on my cutting table. Yet another thrift store purchase, .50 cents. Have had it for a long time, it'll never wear out or break. Good luck!
8-)