This is my concept of Wolvervenom (a Venomized Wolverine) with no color. He does have them, though: black and yellow.

Most of his body is black, but the mask part where his eyes are, his disfigured symbol, tongue, forearms, legs, and feet are yellow.
This is the most dangerous form of Wolverine. It's almost hard for Logan to be reasoned with due to the symbiote bonds to his wild side.