I had ricercar dye me a set of keycaps. They're near black, with a purplish tint, but they look great. I don't have a camera handy, otherwise I would take pictures. He usually dyes them yellow- a set is 45, which isn't too bad for the labor and not having to wait around for a set of donor keys on ebay. The blank set with shipping from keyboardco would have been something like 70 dollars.
One option you have, which I'll consider doing on the next board, is dying the keys yourself in a black RIT dye. I think the lettering should turn black. I didn't do that this time, mostly because I didn't want mess with my first set of filco keys, should I decide to sell this board soon. I would do it with a less expensive board, like a vanilla X-Armor, with no regrets.