Bingowings said:
Nah! Blue for Jedi, Red for Sith, Green for Luke (it sends a message of renewal to have his blade unique and the colour of spring).
Yeah, this'd be my vote as well. As is the colors are kind of pointless. If it was like that there'd actually be some reason and meaning behind them.
Also, the idea of a huge variety of colors (blue, green, purple, orange) has always seemed very fan-fictiony to me.