I'm on a concrete kick and discovered Green Couch. These Oklahoma-based designers are making very cool concrete jewelry and other upcycled products. The rough copper and concrete jewelry pieces are my favorites, and the railroad date nails make great earrings.
If you want to know more, there's a great article about the designers here. In addition to the jewelry, they do graphic design. And if you live near Oklahoma City, they make custom furniture, too.
Images from Green Couch. Via Kara Paslay Designs.