Homemade bath crayons:
Buy some glycerin soap at a craft store. Melt it in the microwave, add food coloring, and pour into a mold. I used an ice cube tray. You can also add essential oils if you go for scents, though I find that a bit unnecessary for bath crayons. Takes about an hour to cool completely, then pop out of the mold and you have crayons!
***I AM NOT THE ONE WHO MADE THIS, I REPOSTED BECAUSE I LOVE THE IDEA AND WANTED TO SHARE IT***