Majel Barrett Makeup Test from The Cage
I believe this clip shows Majel Barrett in a makeup test wearing the green that would be applied to Susan Oliver for her role in the Orion dancer illusion sequence. Sadly, this shot in black and white does not give us the full impression, but the underground Cage walls and texture along with some references I have seen in books and miscellanesous sites leads me to believe that this shot would show us a green Majel in color! A piece of first pilot history and by the looks of it some fun at the time as well.
See a nice close up of Susan in green here, and then imagine Majel that color: