The Bing homepage has a gorgeous image as background, which is updated once every day. It is really cool to have this daily updated Bing image as the lockscreen wallpaper in Windows 8.
There is an app for that! Go to Store, search for Bing my lockscreen and install it. Open the app and in its settings choose the regional Bing webpage whose images you want to appear on your lockscreen. Also ensure the Automatic lockscreen updates option is on. There is nothing more to do. The app will take care of checking for new Bing images and updating the lockscreen when a new image is available.
Enjoy your gorgeous lockscreen! 🙂
Tried with: Windows 8 Pro x64