Where does OS X Lion store the round user icon frame picture?

Question

What is the location of the round silver frame picture around the user icon that appears on the login screen?
I want to find and change it.

Answer 1

The ring around the user image and the glossy overlay is the following file:

/System/Library/PrivateFrameworks/LoginUIKit.framework/Versions/A/Frameworks/LoginUICore.framework/Versions/A/Resources/avatarWhiteRing.png

The mask for the regular user image is the following file:

/System/Library/PrivateFrameworks/LoginUIKit.framework/Versions/A/Frameworks/LoginUICore.framework/Versions/A/Resources/avatarMask.png