cut your cling wrap slightly smaller than your tissue paper. You don't have to be too exact, because you can just roll or push any exposed cling wrap under the tissue without a problem. If you are making a background texture to paint over, cut the plastic wrap large enough to cover the whole surface. Sandwich your cling wrap between your cardstock and tissue paper. Then, using a hot iron, without steam, press the tissue paper until the plastic melts gluing it to the cardstock.