DIY Inspirtion: Hunger Games Kawaii iPhone Case by dimeycakes on Craftster.org here. She used a mold for the Mockingjay symbol - the mold and pin on the phone case are almost definitely polymer clay. She writes:
All cabochons are made with white Sculpey polymer clay and painted with acrylic paints, then glazed with Triple Thick Gloss Glaze (:
For more of her Kawaii cases go to dimeycakes here. *First seen at Geek Crafts here.