I saw the ideas for these on Westerman's site. Chalkboard coasters? I think so! Why didn't I think of that? I already has the spray, and the cork for the bottom (you can also use felt, which I've done in the past for my picture coasters before finding the sticky cork at the craft store). I snagged four tiles at the home improvement story for sometime like 15 cents each. I decided to spray some plastic primer before I sprayed down my chalkboard paint. I do this on any glossy surface, I may be completely wasting my time, but...I pretend it will prevent scratching etc.
I sprayed, added cork, and did a little doodling. These wipe right off. I'm digging this idea!