AG Findings's ($20) is a polycarbonate, snap-on shell that features—you guessed it—a bunch of tiny vents on its back. Though the vents aren't likely to serve a functional purpose, they add a unique design element to this snazzy little case.
Though most iPhone cases strive to add as little bulk as possible, Ark's does just the opposite. According to the company, the bulky, colorful case, "is huge, easy to handle and offers self standing". The Arkhippo won't be available until mid December—and Ark hasn't listed pricing yet—but if portability isn't an issue, this could be the case for you.