Windows 10 Spotlight Images Extractor
Based on this article I've written a Powershell script to help me extract background images that appear on Windows 10 Spotlight during lock screen.
It does not extract only the beautiful background images that I want, but also some trash ;/
However select only those with your current screen width and height and it should be enough to use as a background image ;D
Feel free to fork, use and create an issue if necessary!