Thumbprint Cards Materials Cards & Envelopes Square EverZart Permanent Pens Chromacryl Paint Christmas Lights Card Step 1. Draw a loopy line on a card that extends from one side to the other. Step 2. Use different coloured Acrylic Paint to make thumbprints along this line. Reindeer & Tree Cards Step 1. Apply a small amount of paint to the tip of the thumb. Step 2. Press the thumb onto the card to create a Christmas design. Step 3. Use Yoken Markers to add detail to your work.