I have a Domain running at the Windows Server 2008 functional level, which cannot be upgraded currently due to logistics reasons. I have a group of Student-access clients all running Windows Server 2012 and would like to implement a custom lock/login screen background image across them. I cannot seem to find anything that would let me aside from running custom software which I am adverse to do.
I have tried looking for registry edits, GPO's(which would be preferrable), Group Policy Preferences and have found nothing that would permit this, I do know if I my Domain was running Windows Server 2012 there is a GPO built just for this but do not have access to that. Is there any way I can achieve this using no 3rd party software and/or preferably through Group Policy?