It was super easy to make. Here is the pattern if your wanting to make one yourself: Using a magic circle as your base...
chain 3, 1 triple crochet, 1 double crochet, 1 triple crochet, chain 3 and slip stitch into the magic circle. Repeat two more times to make a three leaf shamrock. Once you have three shamrock petals, your needing a stem. Chain 6 and make a half double crochet in the 2nd chain from the hook and then slip stitch back up the chain and slip stitch into the center of the shamrock and pull the magic circle super tight to close up all the crocheting, then simply cut and tie off the end of the yarn.
It only took me three minutes to make this little shamrock....so... I ended up making 72 Shamrock pins! Sixty for my grandkids classmates and the remaining 12 for me to pass out to my friends.
I'm planning on spending the next few days working out in my yard, it seems like it has been forever since I've been out there doing anything of substance. It's going to get ugly before it gets pretty... that's for sure!