I admit it, I've jumped on the needleminder band wagon. :D
I don't have TOO many (yet!), but I can see that changing, as I've found a use for the one thing my husband gets in his Lootcrates that he doesn't usually want....lapel pins!!
I was pretty pleased. I removed the big stick pin from the back with pliers, then sanded it down smooth with my Dremel. I got my magnets at Hobby Lobby - I think they were the 1/2" diameter size craft magnets (silver, not the black ceramic ones) - and attached one using E6000 clear adhesive. Easy peasy! And suitably nerdy. Since he gets both the general Lootcrate the Firefly-themed one, I was thinking about making more and possibly selling them on eBay or Etsy.