I painted a witch hunter once... (lol, don't worry theres more) and in doing so I reckon black, white, purple and brown would give a kick ass colour scheme, and a very varied one to boot.
e.g. could give militia white shirts and black trousers with brown boots, black shirts and purple trousers, light brown, dark brown, reddy brown... u get the idea.
I definitely reckon black should be in there somewhere. I was going do a witch hunter army once, was going to paint a unit of swordsmen black but then decided against it due to time and cost limitations. Would of been pretty good though. As far as pictures are concerned I swear this topic has come up a few times before, perhaps if u try the search function u might find what u r looking for. Happy heretic hunting