Novelty retailer ThinkGeek has launched a new shell-style iPad 2 and iPad (3rd-Gen) case called Padintosh. Selling for $25, the case’s rear surface has been designed to resemble the front of a classic Macintosh computer from the 1980s, minus Apple’s logos and specific Macintosh branding. The plastic is 2mm thin, with cutouts for the iPad’s ports and buttons, as well as space to accommodate a Smart Cover. It’s available now…