After-the-fact idea (since it sounds like your Episode II is already in the can), but would it be a good idea to make all the Jedi Masters' lightsabers green? In thinking about the purple lightsaber debate, the purpleness does come out of left field in the grand scheme of things. There was no precedent set and, if I am remembering my Star Wars correctly, ONLY Mace Windu has a purple lightsaber, so there's no payoff as to why only HE has the purple saber. Also, there are many blue and green lightsabers out in the galaxy, but ONE purple saber?

This line of thinking of rotoscoping to green would also be paid off in the grand scheme of things by continuing all the way to ROTJ, when Luke busts out his green lightsaber.

Sorry to bring up a potentially finished debate, but I'm interested in getting into the creative process and manipulating others so I can see only what I want and no one else's vision, period. (Just kidding, by the way [mostly]).