They let Larry Niven write some episodes of Star Trek: The Animated Series, so now the K'zinti (cat people Niven originally introduced in his Ringworld stories) are canon in the Star Trek Universe. The producer (or maybe director, I don't really remember) of those cartoons was color blind and as a result, those cat like aliens became cannonicaly purple.
Aww jeez, that's got to suck. Not the crossover part, that's awesome, but the fact someone who is colorblind and might not know it would be put on the spot like that. As an artist, I notice a lot of people from the colorblind community pop up and need help with creative feats that come normally to other people, and I don't have the heart to expect anything in response.