So, I can't do this reference picture, because I'm not creative. xD But, I think it would be SO cool to have a merle marking, and with this, a mutation. In order to get a mutation with this is the normal way of getting a mutie, but the breeding pair must have a Merle marking.
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I got this idea, because double merle is a someone mutation. It only appears when breeding two Merles together. So the mutie would have The Merle Marking, and be blind, deaf, or lethal. The lethal one would have both Blindness and Deafness, and die young (as all lethal)

Thank for the support! If you don't support, please help me out, and feel free to critique. :)