PIN HOW-TO
You'll need bump pipe cleaners, card stock, a utility knife, safety pins, and white glue.

1. Place pipe cleaner on a clean work surface.
2. Bend the top bump into the shape of a leaf (below), twisting to secure.
3. Fashion leaves out of the second and third bumps. Twist final bump around the center of the leaves once or twice to stabilize, then bend it into a stem. Trim off sharp, pointy end of pipe cleaner. Color-photocopy, or download and print, cards and medallions onto card stock.
4. Cut out with a utility knife. Attach safety pin to back of shamrock, then pin shamrock to card. Glue medallion to shamrock.