Was green ever mentioned as a Jedi colour before ROTJ? - I've seen at least one early trailer for ROTJ where Luke had a blue saber glow.

Seems like it was just the real world getting in the way of storytelling - much like Sam Jackson wanting a purple glow.

I'd be fine with there only being blue. The Sith only have red.

People seem to be bent on fixing things with colours but I think there is more to it than that.

I lost interest in Dooku as a character as soon as he lit up his saber - but if he had to be seen with one at all I would say blue - as in one that he'd kept from his Jedi days.

Having a radical colour would seem to imply that he'd want to show it off - make people associate him with that colour. But he still seems to want to hide his past and only use his saber when he's cornered. - he seemed relieved when Jango stepped in to defend him in the arena.

Really, he should have been able to talk his way out of any situation.

Bingowings said:
Luke has obtained a rank always denied Vader when he was a Jedi.

I think you forget there is nobody left to deny Luke, regardless of whether something is appropriate he's going by his own judgement now. ;)