How about cigarette burns? I've heard some beople on this board say they actually like burns. Of course burns are nothing more than some player defacing the chip with a cigarette.

How about lumps of grunge on a chip. Such grunge was not aquired by normal use (sliding of chips over a felt/felt like surface).

I happen to not care for anything added to a chip since it left the manufacturer (including autographs which one might consider similar to rings)

If some things added to a chip are ok and some not, maybe a grunge committee should be set up to decide what is considered defacing a chip and what adds history.