Funny you mentioned it. I looked at that, and it's certainly doable, but more complex than I thought. The same Macintosh icon data is shared for sad mac, happy mac, and possibly some others. Then the "face" data that appears on the mac screen is stored separately. So without a pretty big code change, you could turn the happy mac icon into a bug-eyed mac or something, but you couldn't change it into something completely different.