I think the first color would've been better with red runes and red smoke, and would've helped us match things a bit more.
As it is, only the first and third colors have any obvious mogging potential; the second and third colors are so unusual that it's going to be difficult to get a pleasing match, unless future armor sets we can use incorporate similar hues.
I don't like that I can only test out the artifact colors in the order hall. If I could load them in MogIt, or even via the transmog window, I might spend more time trying to put together a set.
The set definitely speaks to the idea that "less is more". The only criticism I have of it is that the colors are on the drab side; then again, that could also be one of its strong suits -- no crazy clown colors.