I decided to do something totally kid (and mom) friendly. Shaped soap. You can look up directions on how to actually make soap, but this is the wayward way to do it quickly and with the children
You need some Ivory soap and some cookie cutters. Optional supplies include glitter, scented wax or essential oil, and wax.
Here's what to do:
Finely chop or grate 1 or 2 bars of Ivory soap. Here it is finely chopped, but it would have melted better grated. The soap is very soft, so your little ones could cut it with butter knives.
Put your soap in a double broiler and let it melt. (I tried some the microwave, too. It was another fun experiment. It bubbles up really big! The kids would love it.) I added a little water. This is when you would add a few drops of oil or scented wax.
I sprinkled a tiny bit of glitter on them soap. You can dip the glitter side in melted wax if you want to keep it off your hands.