Kul Tiran druids are still missing three flight form recolor variants.
Here is a picture of all four: https://www.reddit.com/r/wow/comments/b1fwqx/the_kul_tiran_flight_form_doesnt_change_colors/
Here is a YouTube video from the BfA beta with all four: https://www.youtube.com/watch?v=2r6LIRRCWf4
The only one available in the barbershop is brown. The other three versions (black, green, and yellow) appear to be the humble flyer variants, which are missing the white marking, so that would be the only thing that needs to be added to the art files.
We’re headed into DF (patch 10.0) and this is an unresolved issue from BfA (patch 8.0), but an oversight is an oversight, no matter how old the issue. Druid forms, in general, could use some updated race-specific customization… particularly travel, flight, and moonkin forms, but a simple recolor seems like the best place to start, especially considering the work seems to have already been (mostly) done in the case of Kul Tirans.
To even things out, it would be nice to see recolor variants finished for Zandalari ground and flight forms, which are limited to a blue raptor and blue pterrordax, respectively. The black, green, and gray skins are only present for cat, bear, and aquatic forms. I’m sure that many Zandalari druids would love, for instance, to use a green raptor and pterrordax that match their other green forms, just as many KT druids would love to use a black bird, etc.
Such a simple, relatively easy thing to add, but it would go a long way. There are many other good customization ideas to be found on these forums, and it would benefit the game to listen to these suggestions as well.