I planned on eventually making chalkboard rocks with paint, but then I found these...Inspired by Pottery Barn, Lizard & Ladybug made some fun chalkboard looking rocks. So a bag of accent rocks and paint pen later this is what I had.
For now they are in a vase on a bookshelf.
I found my rocks at Michaels for $2 something. I just saw them at a dollar store for $1...fyi.