So far I've never bothered to find any wallpapers yet for the phone. The stock wallpapers already are fine for me. The black background help it blend into the screen and bezel.

Most of you saw the stock apple photo showing the purple flower on black background right? Well here it is in real life photo. When shown in the right light, the screen just blends into the phone. A week plus with the phone and the display still wows me.