This is a bizarre question, but here it goes. My wife's first computer was an iBook G4 14" machine, which she loved. That is until the processor itself fried for some reason. I know this is the case because I can see scorch marks on and around the processor itself. That said, she got herself a new machine (MBP 15") and is very happy.
Now, I like to tinker. So I started to wonder if there are any motherboards that can use modern day processors that might be able to fit the enclosure of the iBook. Yes, I know this would be a Hackintosh, but then again this is mainly for "See what I did" than anything else.