And corkboard:
I had bought a pack of 4 small squares of corkboard. Then cut up an old tank top I wasn't going to wear again. Used some kool aid to dye it (I know, not a good dye for a cotton material, but I wasn't going to go buy something. And it's not like it's clothes that will be going through the wash, so I thought it might be ok.)
I still have to work on the keeping it on my wall part. They fell immediately after I took the picture. But it's a bit late for me to be hammering on a shared apartment wall anymore.