Happy St. Patrick's Day!
...are you wearing something green?
This method could be used for a ton of other things too. I have a little puffy heart that I've done the same thing with for Valentine's Day. You could also do this with fabric flowers or countless other things. And I love that I don't have to commit to having a pin permanently hot-glued to something. I am all for lack of commitment and versatility when it comes to crafts.