Have you tried to change the default wallpaper on the Windows 8 lock screen? Now I live in Seattle and quite like the stylized picture of Seattle but in an enterprise environment you may want a more “corporate” image.
Until now you have not been able to do this without using an unsupported method of “hacking” file permissions and replacing the default wallpaper file.
Well this has now changed , the Windows 8 and Windows Server 2012 cumulative update: November 2012 allows us to customize the start screen.
There is a new Group Policy that allows you to “Force a specific default lock screen image”. For all the details on using this group policy setting please refer to the following TechNet article - http://support.microsoft.com/kb/2787100/EN-US.
This post was contributed by Ben Hunter, a Solution Architect with Microsoft Consulting Services.