For my rotary mat rulers (we all collect several sizes) I bought an inexpensive file folder holder that sits on a dresser I have in my sewing room. There are several slots at staggered heights like steps and I set the rulers in there. Some sit upright and the long ones sit horizontal and I can see all of them. Seems to work for me.
Now thinking I need the top of that dresser for something else, I have been thinking of the "metal ring" I've seen lately that hangs on a rod like in a closet. With the rulers having the hole punched in them you can put the ring through the hole and then hang it on a rod. I didn't have a rod or closet in my sewing room till last week when I did install one across a doorway that I wasn't using to hang my stackable shelving that I use for fat quarter storage now. That seems to work out well.
I'll see if I can get a picture in here to show.
stackable hanging shelving
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Ruler storage
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