I don't know where I first came across this idea, but I am pretty sure that it was in a couple of articles in Real Living over the past few months. We just got the door up a couple of hours ago after painting it with White Knight Chalkboard paint on the weekend.
I made a little hanging basket using this tutorial and there is an old peanut butter container in there full of chalk and a duster (plastic for safety's sake). I changed the tute a little bit, doing a few extra stitches here and there because I was using cotton and a different sized hook- this made me feel like a real crochet pro. Go me! It did turn out bigger than I expected, but I am still really pleased with myself.
We'll see if I regret this project as chalk dust builds, but for now I have a happy-finished-project-glow.