Windows Vista already provided several options to configure the logon screen, and Windows 7 adds some extra on top.
Change logon screen background
Save the custom background image as backgroundDefault.jpg in the following folder (Must be less than 256 KByte in size):Then activate loading of OEM background image with this DWORD registry key:%windir%\system32\oobe\info\backgrounds
Credits WithInWindows.com[HKEY_LOCAL_MACHINE \Software \Microsoft \Windows \CurrentVersion \Authentication \LogonUI \Background]
OEMBackground = 1
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