Some people just feel better with protection. iPhone protection, that is. I've been using the Moshi iGlaze case ($25) on my iPhone 4S for the past few days now, and I have to say - it's been a very pleasant experience. Not only does the iGlaze keep my phone from getting scratched up in the back (thanks in part to a buffer film that you attach before slapping on the case), but it also keeps my iPhone 4S looking slim and trim. The sides of the case don't protrude out, and after a while you'll barely know you've got a case on your device. What's more, there's a nice matte finish on the back of the cases of color, while the clear version virtually disappears altogether.
The Moshi iGlaze comes in the five colors you see here (along with a clear version), but you can get a closer look in the gallery!