When using the uploaded wallpaper or any wallpaper I guess without shading or detail. You'll see dirty horizontal lines across the screen from top to bottom. They get even more noticeable when you slowly drag to the left to the widgets screen. Tested on an iPad. You can hardly see them on the home screen but they are there as well. I'm guessing it's some sort of dark filter that's applied to all wallpapers. It did not do this with iOS 9.