Software :: Change My Computer Icon In Leopard?

I have a black macbook, and the icon in my sidebar is a white macbook. I'd like to change this to be accurate to my computer. I came up with a "fix" of sorts, but I'm looking for a better one. Here's why:

In coretypes.bundle>Contents>Resources, I see both black and white macbook icons (com.apple.macbook-black.icns and com.apple.macbook-white.icns). I backed up the white one and copied the black one over the original white one. That makes my computer icon black, but it also makes my wife's white macbook have the black icon in the shared section of the sidebar.

I changed everything back, and made sure that imac.icns is the black macbook; it was originally, but I backed it up and rewrote it by copying the black macbook icon anyway. No dice, my icon is still white.

Is there any way to make the icons accurate for both my computer and my wife's? I know it's aesthetic, but now it's become a pet peeve of mine.