Our Girl Scout troop decorated pillowcases with Crayola crayons, but any wax-based crayons will work. You can also use a fine to medium grit sandpaper sheet to keep the fabric from shifting if you don't have freezer paper. Just let them color to their hearts' content. Remember, the more crayon, the deeper the color, so make sure they press the crayon firmly on the fabric. Place several layers of newspaper covered with a white papertowel on your ironing board and place the fabric crayon side down on the paper. We actually turned the pillowcases inside out and put the newspaper inside them. Place another papertowel on the wrong side of your fabric (to protect your iron) and press with a hot DRY iron. This will melt the wax and set the color.