Swisstrax, a company out of California, makes an interlocking recycled content floor tile called Ecotrax. Made with PolyDyne Engineered Rubber Powder, or recycled rubber tires, Ecotrax — according to the company — is durable, strong, and 100% recycled. Also, to close the loop, Swisstrax takes its products back to be recycled into future products. It's available in gray colors, various patterns, and two sizes, 13” x 13” x ½” and 15.75” x 15.75” x ¾”.
Public Architecture, the firm behind Scrap House, just published a free primer on the topic of material reuse. The Design for Reuse Primer, funded by the USGBC, includes 15 case studies of all sorts of projects — civic, education, residential, office, retail, interpretive, religious — calculated to show that "material reuse represents one of most creative, exciting, and effective approaches to building green."
I’ve always loved recycled paper countertops and recently noticed ShetkaStone from All Paper Recycling. SketkaStone is made with old paper and can be used in countertops, vanities, sills, and moldings. It will also hold up to use; the manufacturer told me in an email that no other similar product on the market “can match our durability.”