When I had the GKs make my mother squares I chose the size of the black. ironed some freezer paper. Yes iron it first cause freezer paper shrinks, then iron it on the backside of the square. let the kids draw on it with regular crayons. then heat set it. (turn the square over and make sure you put a piece of paper under the drawn side to catch the oils from the crayon.) remove the freezer paper and sew it together. Hope that was understandable