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What an awesome idea! My sister and I would have had great fun pretending to teach "school" outside. And the turquoise is delish!!
"I just used a pre-cut 2'x4' piece of plywood, sanded it down, and covered it with chalkboard paint. The frame is made out of our left-over 1x6 cedar fence slats, which you can purchase very inexpensively at the lumber store. The frame, however, is anything but professional...but it worked! I used wood glue and a staple gun. I cut to size, then stapled both front and back of the wood to hold together! Then painted, and used wood fence screws to hold it securely on the fence."