LOVE this technique - the possibilities are endless with the beautiful napkins you can find.
Directions on the tech card are:
Cut your napkin into smaller pieces, usually quarters. Many are 2 or 3 ply. Peal away any plain layers leaving just the top, colored layer. On an ironing board, layer as follows: a thin pad of plain paper, your piece of card stock, a layer of saran wrap, then your napkin with the colored side up & then another sheet or two of paper. Iron on medium heat for 20 seconds or until plastic is melted. Cool & trim piece to size.