This craft was really easy, and fun. I bought a package of rings in the favor section of the store, and used chalkboard paint to spray the tops down for a writing surface.
I've seen tons of chalkboard jewelry on Etsy, and if I were 20 years younger, this would be in my accessory box for the first day of school. I'm not, so I hide it under my socks and wear it when nobody is looking. When school is back in session, these will find a home in my prize box.