A few years ago while visiting Ikea I picked up some of these cheap frames. I'm not sure what they're called but they're made out of pine.
I had some Chalk Board paint lying around in the house and I knew that I want to paint a chalk board section on one of their walls but since I've never painted with it before I thought I'd practice on something smaller.
I first pulled the glass/plastic out of the frame and gave it two coats of the chalk board paint. I then let it dry. There are easy instructions on the can for you to follow.
While the chalk board paint was drying the girls painted the picture frames. I only have N's chalk board picture frame in these photos. I think it turned out really cute.