Contexture Design has announced that it has refreshed its 45 Nano Cases line of iPod nano cases for compatibility with the fourth-generation iPod nano. Made from reclaimed audiocassettes, these limited-edition cases offer open access to the nano’s Dock Connector, headphone jack, hold switch, and Click Wheel, with integrated protection for the device’s screen. Contexture Design’s 45 Nano Cases for iPod nano 4G are available now and…