Also on these boards
Bathtub crayons | Little Crunchy Mama Buy glycerin soap at a craft store. Melt it in microwave, add food coloring, and pour into a mold. I used an ice cube tray. Takes about 1 hour to cool completely, then pop out of the mold and you have crayons!
Bathtub paint! Tried it out this evening and I will definitely be doing this again. I used flour instead of cornstarch, it worked perfectly fine. Don't add too much water or else it becomes much too soupy. Once we were done I turned on the faucet. The water was blue and full of bubbles (I used J for the shampoo). The boy enjoyed that part as well. Easy cleanup too!