My quilt class used Crayola brand crayons to color on muslin. We brought in all kinds of textured stuff, like lace, rug backing, screening, anything with texture which we put under the muslin before coloring. You can get some really cool looks doing this, and anything is fair game. We were doing Sunbonnet Sue's and I loved how the straw hat looked textured, etc., instead of just flat coloring. Oh, we heat set it using old dishtowels between the crayon and the iron. No problems with multiple washings. They told us to just avoid the cheap crayons, as there is too much wax in them. Happy coloring. We had a blast doing this.