Color of the Lightsaber. What Color are You? Was the story originally written, or does it continue to write itself?

Okay, so with the original trilogy, the original film, in fact, "A New Hope" we are exposed to only two lightsabers. First, the blue one that Obi-Wan Kenobi gives Luke from his father that Uncle Owen would not allow. Then, Obi-Wan has to pull his out to defend Luke from somebody looking for trouble in the Cantina. We would later see the "evil" Darth Vader pull his out to dual it off with Obi-Wan, and what a surprise! It is RED!  So we can make the assumption at this point that good guys use blue lightsabers, and bad guys use red ones, right?  Wrong!

Had it not been for a blue lightsaber not looking correctly next to the skies of Tantooine, this may have been the case.  Unfortunately for the fan, the blues clashed and the green lightsaber was invented.  I have to ask the reader here, do you think Lucas knew the door he was opening up with this change?  Now as a result we have different classes of Jedi, each carrying a different color blade to distinguish them.  (Probably) unbeknownst to our friend Mr. Lucas, a blue sky created a distinguishing insignia for Jedi.

Next will come classifications of Jedi and their color.  In the meanwhile, what color are you?