These demons are originally from Warmaster, but given the amount of models available for Epic Armageddon these days, you just have to learn to “Do It Yourself”.
I did 20 of each. That should keep me covered for some time I think.
Bloodletters was undercoated white, drowned in red, horns snakebite, weapons silver. And then an ink over it all
Plaguebearers were drybrushed english uniform or goblin green, and after that dwarf fleshed was drybrushed on.. and then an ink over it all. Weapons painted brown and then orange.