Based upon Griffin's earlier, transparent-backed iPhone 4 case Reveal, the new Reveal Etch ($30) is a more expensive version with a more distinctive faux carbon fiber back panel described on the box as "Graphite." Though the opaque rear panel is clearly made from plastic and adds no grip to the slippery iPhone, it looks quite nice by faux carbon fiber standards, and is accompanied by rubber edging with holes for the headphone port, microphones, speakers,…