Crayon Molding turned out to be TONS of fun! Since my craft partners were 4 and 5 years old I had to think about the safest way for them to work with hot wax. I used a warming tray that I found at a garage sale. I turned the warming tray on high and made foil bowls for the girls to drop their peeled crayons into. They melted like colors together and then soon started mixing colors. It was a great lesson on color mixing. Next time we do this we will advance to color layering and marbling.