Similar to the company's earlier iVolution Top for iPhone 4, minus the "top" flap, iVolution Grip ($65) is a soft, floater leather-covered hard shell with a second color of leather inside, and a metal Vaja accent near the iPhone 4's Dock Connector port. Designed to be open, iVolution Grip provides very limited coverage for the device other than its back surface, leaving the top camera corner especially exposed. Eighteen exterior colors and 29 interior…