Contexture Design, makers of the “45” vinyl iPod cases, has announced 45 nano, a new line of cases for the first- and second- generation iPod shuffle made from reused audio cassette tapes. The cases’ backs feature a hollowed out area to fit first- and second-generation iPod nanos, shielded by a clear plastic window that includes openings for access to the iPod’s controls, headphone jack and Dock Connector. The front of each case…