To change the boot login background, do the following:
1. cd /System/Library/Framewoorks/ApKit.framework/Versions/C/Resources
2. cp NSTexturedFullScreenBackgroundColor.png NSTexturedFullScreenBackgroundColor.png.lion.orig
3. cp your_new_background.png NSTexturedFullScreenBackgroundColor.png
To screen capture the login page, do the following:
1. sudo screen -m -d bash -c "sleep 60; screencapture /Users/USER/Desktop/login.png"
2. Logout and move your mouse cursor out of the way.
3. Wait until you hear the sound of the camera shutter.
Voila!
Have a great day!
Brad
