In my ongoing quest to pipe something symbolic of the Olympics or the United Kingdom every night of the games, tonight Northern Ireland gets its nod with a shamrock (can you believe I didn't pipe these back on St. Patrick's Day? I was really into gum paste then). All you need to pipe shamrocks are green stiff consistency royal icing, a flower nail, parchment paper squares, a glue stick, round tip #3 or #4, petal tip #104 (or #101 if you want to make smaller shamrocks), a Styrofoam block to rest the nail in, and a dusting pouch filled with a 50/50 mix of powdered sugar and cornstarch. Start by sticking a parchment square to the nail with a dab from the glue stick.
…and then the third. Touch a fingertip to the dusting pouch and use it to neaten up any edges that don't look right.
Here's another side view.