SwitchEasy's Nude for iPhone 5 ($20) is designed for those who want super simple, super slim protection. The single piece of polycarbonate plastic snaps on like a shell, although the coverage along the top edge and built-in button protection cover more of the iPhone than is typical of the genre. In addition to the wide selection of glossy bright colors, users also have the choice of pastel matte finishes or transparent cases. Nude comes with a pair…