However in 10.2, the toolbar already has a flat panel imac, but not the icon I wanted. I tried changing the icon as I did before in 10.1, however the toolbar icon would not change. It baffled me.
After some digging, I discovered that the imac.icns is in a new place: /System -> Library -> CoreServices -> SystemIcons.bundle -> Contents -> Resources -> iMac.icns ... you need to swap that icon to change the computer icon in the Finder window toolbar.

