Before the OS X Lion there was a possibility to change the default Lion login screen background in Mac Os X Snow leopard. You just have to replace the file at : /System/Library/Frameworks/AppKit.framework/Versions/C/Resources/NSTexturedFullS creenBackgroundColor.png. But now from the OS X 10.7.4, this has been reverted to the original textured pattern. Does anyone know the location of the default background file? Is it really changed or just the method?