I have done a lot of crafts in my lifetime but this might be one of the neatest ideas that I have never thought of.
We went outside on the hunt for some smooth rocks and washed them. After washing almost all of them, I thought about scrubbing them with an old toothbrush. That really made things go easier. We let them dry off while we went to see some reptiles at the library.
When we came back, we put the on a foil-lined baking sheet and baked them at 350 degrees for 15 minutes. When they were ready, A. “colored” them using crayons. The wax melted and turned into a sort of paint for the rocks.
I highly recommend using as flat of rocks as possible because the wax drips very easily. Most of our rocks were not flat, so it was hard to make certain designs. She tried really hard to draw a heart on one of them, but it dripped down the side. I encouraged her to just try to draw designs instead of certain shapes.
Total cost: $0