Chalkboard Placemats

I saw these at Pioneer Woman's blog this morning and thought, "what a great idea!"  They would be great for homeschooling moms and actually any mom for a variety of uses.  Ree Drummond shares some of her ideas that I thought were pretty clever as well.  They are available through be a friend to knit with and are only $33 for a set of 4.  Not too bad a price I'm thinking.  If anyone has any other ideas for how to use these, please post in the comments section.  I'd love to hear them.