I'm not sure if this has been addressed yet or not... I gotta give props to Macrosoft for this...he's constantly tweaking things out. I now know how to change the login background to anything u like! By default, the login screen is the "Aqua Blue" desktop which is located in your Desktop Pictures folder in your main Library. All u need to do is take whichever image u would like to use instead, make sure it's set to whichever your native resolution is (72dpi, jpeg format) and rename it as "Aqua Blue.jpg," replacing the original image in your folder. Now logout and view what your new login screen looks like!