Yeah, it is a fad. Keep adding more to the list because I have to make more for T&C people.
Take a pencil tool, select a color, color over a new layer in the right spots, then set the layer to "Hue" or "Color". Would use the fuzzy tool and just select it, but I've found that PS effs up small things like that. ):
I think I might have to do it manually next time when I recolor something to black, white, or gray. Filters just can't do it right.