Again, the whole warhammer universe is not based on any lever of credibility or accuracy. Those models are for their tabletop wargame, and as such their paint scheme is pretty much 'anything goes'
The few interiors I've seen painted had black control panels with various colours for the buttons. Most screens were green, walls were a light gray or white, same with floors.
Just pick a colour that complements your exterior. That's what I did :)