Starth Bing Wallpaper is a free and open source app change your device background or lock screen with Bing image of the day. (some non-AOSP systems are not supported lock screen)

Features:
1. Automatically change your device background or lock screen daily with Bing image.
2. Browse Bing image from the last two weeks.
3. You can manually set the Bing image as the background or lock screen.
4. Save the Bing image without logo.
5. View daily Bing stories.
6. Desktop widgets.
7. Lock screen wallpaper function MIUI(need root) work on Android L(21) and above Other System work on Android N(24) and above.