Warm up your walls with Mesquite tiles from Ann Sacks. The tiles come in 4x4, 8x8, and 2x8 and are made of mesquite, a dense wood ideal for use as a tile. There are three finishes available: natural, natural with UV protection, and walnut.
This reminds us of that great wall just inside the Natrona Furniture showroom on 20th Street. The organic quality of the tiles would look great in stark contrast to an otherwise minimal interior.