As the show is in Pittsburgh, I also incorporated some of the metal objects I found in the street when visiting over the summer:
Natural blue zircon and polymer clay faux bird-skull by Dee Wilder.
Spring washer, black spinel and freely-moving carved camel-bone skull.
Nut, silver, amethyst and chrysoprase. I will clean the setting wax from the stone before sending!
Obsidian skull set on a washer, hung with a garnet.
Sawblade from Pittsburgh, needles from Clydebank.