Favorite Lock Screen is a small tool,and you can install your favorite lock/start screen image on Windows 10 or Windows 8.1.
Yoou can choose an image file folder, and the program installs a randomly selected lock/start screen image each logon.
The supported image file formats are JPG, PNG, GIF and BMP.

Favorite Lock Screen v1.2.90 Changelog:
fixed Windows scheduled task
Requirements:Windows 10/8.1
Webmaster’s note:You cannot successfully install on a Windows 7 system.