When I was shopping for butterflies the first time around, I spied these already-made chalkboard butterflies at Michaels for three dollars and scooped one up for the children to draw and color on.
The chalkboard came with a twine hanger threaded and knotted through the holes at the top. I cut the twine off so we could use the butterfly at our art table. The set up was really pretty simple. Just the chalkboard and the chalk in one of my insect trays from Cost Plus World Market (from 2011). I mean really, look how pretty the chalk looks...all those happy colors. The children had a damp sponge and/or a piece of flannel to wipe the board clean. One of my industrious kiddos got a hold of a wet wipe to wash the chalk dust off his hands and continued to use it as an eraser. While a lot of fun, this board did not work as well when wet. You know how vibrant chalk looks on a wet board, or wet chalk looks on a board? It didn't work on this board...I have no idea why but that did not deter the kiddos at all.
Sorry about the blurry photo. This is the only one I managed to get of the set up. Even though I wiped it down you can still see evidence of the chalk all over the surface. For some reason, the children also preferred the brown chalk above all the other colors. Go figure.