Put crayons of your desired color into a container that you will sacrifice to making candles. I would say a good 10-15 crayons. I would put colors that go well together, such as green & blue or orange & yellow, into one candle. Put the crayons into the microwave and nuke 'em for 2 minutes at a time, until it is smooth. You don't want to wait to pour it into the mold after they are melted, because the wax will start to set up fast.