Yoga Mat Wall Hanger

I needed to get these yoga mats off the floor when they weren't in use, so my sons could have more space to spread all of their sharp, pointy toys around on the floor. Fortunately, I had plenty of wall space above the weight rack, but how does one hang a big rolled-up piece of foam without it looking weird?

I couldn't find anything around the house that I really liked as a hanger. A shelf would be overkill, and I would still need some sort of lip or stopping mechanism to keep the mat from r