Here's my character Aragul, who's had a bit too much of dat Fel. He has a Fel amulet in his hand which allows him to use the Fel at will, but keep it contained enough for him not to loose control. And it also allows him to revert back to an un-green and un-mutated form :) because of his use of Fel, even though he's not corrupted by it, he has permanent green eyes.