You can buy transfer pencils to trace the design with then iron it onto the fabric. Draw around the design with a .05 pigma pen then fill in with the Prang brand crayons. Then you sandwich between paper towels and press with a dry iron. Prang is 6.98 but has 64 colors and is softer than Crayola. They have more pigment in them and better color retention. Go to
http://www.patterncentral.com for more info.
They have iron on transfers but I didnt care for any of them.