I've had icarbons on all my phones and love their products. The feel and quality of their vinyl is top notch and install is a breeze. Also their customer service is great.
Here's a link to the black CF i had on my 4s
https://forums.macrumors.com/posts/14023494/
I would however stay away from slickwraps. I just installed a brush metal skin on my 4s and the side wrap is cut poorly and too long. I emailed their support (even with pictures) and they apologized and said I can have 25% off my next purchase... sad sad service from them