Free Christian Wallpapers & Free Christian PC Backgrounds Checkout C28 huge selection of Free Christian Wallpapers and Christian Desktop PC Backgrounds. Bold, edgy artwork featuring design from the NOTW Christian clothing line. C28 is an alternative Christian lifestyle retailer, offering a huge selection of bold Christian t-shirt designs, Purity rings, Christian jewelry, cross jewelry and necklaces, Christian gifts, and other Christian products. C28 is short for Colossians 2:8, which is all about Christ and Not of This World.