My best friend and I nicknamed each other after everyone's favorite dynamic duo: R2D2 & C3PO, so i've taken to labelling our stuff with the respective droid. These pins were made for our bed caddies but could of course be used for clothing.
To get the fake enamel pin look, print in black, silver, or gold and fill the wells with paint (I used folkart dots), then put a ridiculously thick layer of mod podge in it and let dry. I would strongly recommend a 0.2mm nozzle