Griffin's first plastic case for the iPhone 4 is Reveal ($25), which uses a combination of rubber edging and a clear hard plastic back to protect all of the device save for its screen. The opaque rubber has holes for the headphone port, microphones, speakers, and vibrate switch, with integrated button covers; Griffin's rear cover has a keyhole-shaped hole for the iPhone 4's back camera, unfortunately interfering with the LED flash due to the hole's…