I actually would like to believe that when you construct your first light saber you can have "Any Colour You Like" Pink Floyd FTW. Why cant we have some orange and pink ones in the mix too. After all the saber colour shouldn't have to be symbolic. I think the jedi should say Hey I like this colour. If my favorite colour was purple I would have a purple saber. If you wanted it to be symbolic it could go as follows.

Younglings (white)

Apprentices (Any colour but Blue Green and Red)

Knights (Blue, Green)

Masters (Unlimited Colour Well Except red)

Sith (RED RED RED RED)

Badasses (Purple LOL)

Lets add some more colours yall. Savor the rainbow. Even different hues of each colour.