This may be all you need. The Spigen Ultra Mix Front and Back Protector.
Spigen has always been reliable for me, if that doesn't seem to do it for you, you can also check out **********.net for back protectors that are in carbon, metal (sticker), or even leather. I also bought the metal series from ********** to try them out, however, I will warn you that they will take a while to get to you.