Available in several different colors, in either faux leather or polyurethane with a carbon fiber-style texture, Spigen SGP's Skin Guard for iPad mini ($20) is otherwise a pretty standard sticker. Instead of covering the entire back of the tablet, it's a rounded rectangle about 4.9" wide and 7.4" tall, with a single opening for the camera. In the package, you also get a cleaning cloth and a metallic Spigen sticker. The company says the protector can…