Recylced crayons are one of my kids favorites and we always have an abundance of broken crayons around the house lol. Its super easy just take off the wrapers and break them into inch long pieces. You can use a muffin tin, silicon shapers anything that can go in the oven. Just fill them about half way and heat them up at 350 degrees for about 10 minutes or until totally melted. DO NOT remove from the tins until they are totally cooled off. It makes awesome swirly fun.