You could wear these as a pendant with a simple chain or as the focal of a beaded necklace. Earring clutches can slide onto the 20 gauge wire to hold everything together or you can simply wire wrap a loop. Since there are so many openings in the filigree, you can also use jump rings as an attachment. I can envision one of these riveted to a leather bracelet. Hey, where's that old belt? :-)
The head pins are the bomb because they're more than a head pin ... plus this design means that the enamel head pin is less prone to cracking.
Do you have any ideas on how else these could be used? I'm going to give you a chance to try some of them, because Monday I'll announce the details of the giveaway!