From "Star Trek: Let That Be Your Last Battlefield (#3.15)"
[Bele and Lokai are bi-colored aliens whose skin is white on one side and black on the other, except on differing sides
You're finished, Lokai! We've got your kind penned in on Cheron into little districts, and it's no good to change. You've combed the galaxy and come up with nothing but mono-colored trash, do-gooders and bleeding hearts. You're dead, you half-white!
[to the crew
] You useless pieces of bland flesh.