Set any Bing image as your wallpaper. BingPaper set your wallpaper to the daily Bing image. You will no longer need to save the image then set it as your desktop background.
You can set this up as a scheduled task to completely automate the process. The application is written in C# using WPF.

Requirements:
* .NET Framework

The license of this software is Free, you can free download and free use this wallpaper tool software.