Choices were limited in the mail category, but I think I managed to come up with an overall set I like. I stuck with the Ebonhold pieces as a base since I wanted the set to be predominantly black. Then I picked out a chest piece and belt that had a bit of blue and teal in them. Belt will be a pain to obtain as it drops from Heigan in Naxx, and hilariously despairingly the chest piece is from Kara (just when I thought I was finished with that place after getting my rifle!) I found a wonderful cloak that encompassed all of the colours I wanted. Finally, the Crypt Fiend Slayer was the perfect bow to add some blue to the set and bring out the colour of Skorn's eyes. I ignored the tan on his belly since I imagine it to be grey anyways, and I didn't want to draw attention to that colour in my set.
Anyways, I really only have to farm for the chest and belt, which will probably take a while, but at least I have a goal now.