I used an old pair of jeans to make a holder that works for all my rulers. I cut one leg short and stitched up the bottom, this part holds my long rulers. Then I added some more pockets (made from the other leg) to hold the smaller rulers. My big squaring up rulers and my large crosshair marking template live in the waist. I slipped a square dowel through the belt loops on the back and hung it on the wall that way. I now have two of these and they work great to hold all my measuring rulers and templates. They're not pretty, but they get the job done and it's easy to find the ruler I'm looking for.
Rob