KIQ Silicone Skin Case Cover for Microsoft Zune 80GB 120 GB - 7 COLOR BUNDLE SET
Other than the fact that this is still advertised as a seven pack, though it does mention later in the product description that this is inaccurate, I am quite pleased with my purchase, the cases are light and malleable enough to make swapping them out/off for charging in a dock and whatnot is easy.  Delivery was quick too, even for the slow option, I ordered my new Zune at the same time as these and they outpaced the Zune by a week.