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Don't use moving 'dynamic' wallpapers
iOS 7 now comes with dynamic wallpapers that adjust based on your hand movements, such as bubbles that float around the screen depending on which way you hold your iPhone. These moving backgrounds consume far more battery power than regular static wallpapers.
To select a "still" wallpaper, go to Settings > Wallpapers & Brightness and scroll down, then tap your existing wallpaper under Choose Wallpaper. Either select a background from the Stills category, or a static photo of your own choosing.