I remember the first images for The Next Generation I saw were black and white stills in People Magazine.
The first-released publicity still was in colour, in TIME magazine. Here in Sydney, a few days later, we had a large science fiction media-themed masquerade ball - and I turned up in a quickly mocked-up Data costume, made from two turtle-necked tops, spliced together.

Denebiet Dinner Dance Data by Therin of Andor, on Flickr