On Huawei devices you can set different pictures as lock screen wallpaper and Home screen wallpaper. To set or change wallpaper on Huawei Ascend P6 do as follows:
1. Open Settings and go to All tab
2. Under Device settings, open Display.
3. Open Wallpaper.
4. Tap "Lock screen wallpaper" and select to use the home screen wallpaper or other wallpapers
5. Tap "Home screen wallpaper" and set it using wallpapers, live wallpapers or the images in the gallery
6. If you enable Shake to Change, the wallpaper changes as you shake your phone (Only works on the default launcher)
7. If you enable Random Change, the wallpaper changes randomly at the given time interval