I've probably said this before, and I'll probably say it again when this debate comes around again. There are two options I'd be really happy with, depending on how the Jedi are portrayed in a given edit:

If the Jedi are being portrayed as stuffy, narrow-minded dogmatists, then a single colour for all of them — presumably blue — makes sense. We could make exceptions for Qui-Gon and Dooku (if he's a renegade Jedi rather than an outright Sith) — they can have green to go with Luke's similar individualism in ROTJ — and possibly a few others (maybe the Council can have purple or gold or something). If we're going to colour-code people, there should be a reason for it.

If the Jedi are being portrayed as genuine good guys, then they should have a multitude of different colours. Each Jedi's sabre should be a slightly different hue, taking in any shade of blue and green or even a wider spectrum — the former is probably easier on the eyes lol. Needless to say, this would take a lot more work than option #1, but could look very cool. Similarly, the Sith that we see can have different shades of red — varying from pink to purple to orange — assuming that we see Siths other than Vader or Maul using their sabres.