Keeping your phone free from scratches can be quite challenging. Just placing it on your desk can be enough for small scratches for form on the back cover. The most popular skin is the InvisibleSHIELD by Zagg, these are clear thin films that cover your phone and protect it against damage. As they’re clear, your phone retains it’s original look.
If you fancy something a bit brighter, or want to put your own stamp on your phone then take a look at Gelaskins or ZEOdigi phone skins 🙂