Where is the generic Other Image? On a mac, when you enable 'Other' on the login screen so that network accounts can log in, the large circular image that comes along with it is a gray silhouette of three heads.  Where is this image on the hard drive?  I'd like to swap it out with something else.
It is here:

/System/Library/PrivateFrameworks/LoginUIKit.framework/Versions/Current/Frameworks/LoginUICore.framework/Resources/OtherUser.png