Locally (British Columbia), Mass Market has produced painted TBs (when no one was trying to do this-solid coloured mares, race bred).
I have a friend with a Songandaprayer stallion who shows paint characteristics himself. Belly spot, socks, and a splash up the side of his face to his cheek. She is/was looking to rehome him. He was a hard knocking, honest local racehorse, not stakes class but solid, with a great disposition and well liked by those who worked with him. Nice looking horse. I suggested she get him jumping enough to promote him for other than strictly as race producing, and/or promote him to the “paint breeders”, but she has not been able to do this. He has some ankle hardware, IDK how sound he is. His first crop (4 foals I think) are weaners of 2015, and nothing much in the oven for 2016.
Probably info that is not much use to you, but there it is anyway.