Will probably get voted cold but I thought this was too cool (pardon the pun) not to list. It is a Cassette Tape style silicone cover AND Case :) Spiel for the website:
Go back to the future with this fantastic iPhone cover that combines the retro chic of a traditional cassette tape, with the state of the art technology that is the iPhone.
The form fitting silicone cover will envelope your precious iPhone, or iPod touch, protecting it from scuffs, scrapes, bumps, and falls. While the silicone cover is designed to look just like an authentic cassette tape, it will still leave the screen visible so you will still be able to access all of your music and apps.
Of course, no cassette tape would be complete without a case for it to sit inside, and this silicone cover is no different. The case still allows your headphones to plug into your iPhone, whilst giving it slightly more robust protection than the silicone cover. The really neat thing about the case however is that once it is fully opened out it also acts as a great iPhone stand, allowing you to rest your iPhone on any flat surface in landscape mode, perfect for watching videos!
It is the perfect gift for the fan of the latest cool, quirky gadget, or for that iPhone owner who wants a memento of his/her youth.
Cassette themed silicone sleeve and plastic case Fits iPhone/3G/3GS and iPod touch Please note that this will not fit the iPhone 4