There's a perfect way to do him for Nolan's world only.
He's an actor that owes money to the mob or someone powerful. He dont pay, they hunt him down and inject him with some poison or something, but it doesnt kill him, it makes his face and body skin deform or sagg a bit like mudd.
So he survives, see's his face looks like a pile of clay now. He goes mad and becomes a Jack the Ripper type killer, killing his victims and stuffing clay down their throats, as a trademark.
Perhaps he could wear a clay mask to cover up his sagg'ing deformed face, a mask that looks like the ClayFace from the cartoons?
There are ways to do it, just have to be creative. That was just an overview of my idea, just a sketch...not into typing it out thoroughly lol. It's not the best, but a bit realistic