I finally did something on my list! I sat down yesterday evening, after the kids were
hot rocks this week, which have been a hit since the first summer I came to camp. I found the instructions in Summer Crafts: Fun and Creative Summer Projects for the Whole Family by Marjorie Galen. This is perhaps my favorite craft book of all time, and certainly the one I use most at camp. Here's a snap of the Hot Rock Garden outside the Art Room.