Christian Twitter Backgrounds, Free Christian Twitter Layouts from C28.com. Featuring the designs of the NOTW clothing line, this artwork is a bold way to show your faith on your Twitter profile!. C28 is an alternative Christian lifestyle retailer, offering a large selection of bold Christian t shirt designs, Christian jewelry, Christian CDs, Christian gift ideas, and Christian accessories. C28 is short for Colossians 2:8, which is all about Christ and Not of This World.