Whether you like or hate the Crocs brand rubber shoe, there is no doubt you can accessorise the holes in them with charms. (though if you plug them all up, they don't breathe as well) The shoe charms have a screw on, snap on, or button like device on the back, so it works a bit like a pin. These charms are classic style Sonic faces, done in molded & cut-in soft plastic.
What company produced these? How much are they? Where can you buy them? Write in for credit if you know the answer!