Proporta has announced it is offering its Shine case for the iPod nano (with video) in denim blue for a limited time. Announced in December, the Shine, previously only available in black or red, is a flip-style patent leather case with magnetic closure, internal mirror, removable lanyard, and cut-outs for access to the nano’s ports and hold switch. Like the black and red models, the denim blue Shine sells for $40, and is available now. …