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For this technique you need a sheet of waxed paper, which you scrunch up into a ball and then smooth out again. Lay this over a piece of cardstock and place a scrap piece of paper over the top.
Iron this "sandwich" with a hot iron (no steam) making sure that you are pressing down rather than running over the paper. It only needs around 5-6 seconds pressure all over.
Separate the layers and then you can ink up a brayer or a very slightly dampened sponge with the dye ink color of your choice. Roll this gently across the cardstock and you will have a great background pattern! Set it aside until the ink has dried completely.