Yeah, leave all the fancy lightsaber colors for the games - for the movies, it's blue & red, good & evil, until ROTJ.
Before the PT, I always felt that there was heavy symbolism in there - that the Jedi had been trying to take a "pure" good path and failed, while the Emperor and Vader had been taking the 100% evil path which, obviously, is never good. But you need something in between to balance everything else out, and that's clearly what ROTJ was (should have been) about - Luke taking the "middle way," if you will. I felt that Luke's victory symbolized a new era of Jedi that would follow Luke's "middle way" and become truly benevolent protectors of the New Republic.
Then the prequels showed up and the Jedi were ... um ... not like that at all. Then AOTC came out and Mace fucking Windu had a purple lightsaber? Really? What the fuck is that shit?
Now I know, of course, that there was no symbolism to Luke's lightsaber color beyond "It shows up against a blue sky better than blue does."