#1
For example, Angus Young uses lightning bolt inlays, and Tony Iommi has inverted crosses on his guitars. I'm sure there are many other guitarists who have their own signature inlays, but I can't really think of any off the top of my head. Anyone aware of a list like this somewhere out there?
#2
Don't think there would be a list of something so small. Off the top of my head I guess there's also Synister Gates, Scott Ian uses the same bolts as Angus, Robb Flynn has the Love Death inlays, Steve Vai's flower thingy (not sure if he started that or not), and i guess you could count Buckethead having no inlays.