Some paper napkins are so pretty, it seems a shame to use them for wiping your hands; instead, recycle a few into one-of-a-kind notecards. First, gently pull apart the napkin's layers (you want only the top, printed one) and smooth out creases with an iron on medium heat.
Using a blank sheet of paper as a work surface, lay the napkin printed-side down and spritz the plain side with Spray Mount Adhesive.
Place a blank folded notecard facedown on the napkin, pressing evenly with your hands. Turn the card over, fix any wrinkles with your fingers, and trim overhang with scissors.