I've been reading through large portions of this thread, and I see a lot of discussions about lightsaber colors.
I just thought I'd throw my two cents in. :)
First of all, the Jedi, by the time of the PT, were generally using 3 colors, based on what type of Jedi they were. (Note that Mace Windu was an exception)
Wookieepedia has an interesting entry about lightsaber colors. "Around 4,000 BBY, lightsaber crystals were used to indicate a Jedi's chosen class. Blue indicated a Jedi Guardian, a Jedi who used the Force on a more physical level. Green indicated a Jedi Consular, a Jedi who preferred to ponder the mysteries of the Force and fight the dark side at its heart. Yellow indicated a Jedi Sentinel, a Jedi who honed their skills in a balance of combat and scholarly pursuits."
So, if any lightsaber recoloring is to be done, I think one thing that would be cool is to make some of the Jedi's sabers on the Geonosis arena battle yellow. That way, we can say that some Jedi Sentinels were there too, not just Guardian's and Consulars.
Now, Mace's saber color is a total exception to this. According to Wookieepedia, Mace "...informed the Council that he wanted a true challenge in order to find the best pieces for his lightsaber. After considering this, the Council sent Windu on his own to the world of Hurikane. While on this mission, Windu was at first chased away by the natives that resided there, but was easily able to resist them using the Force. When he caused one of the fragile natives to shatter, he sobered, and painstakingly restored it using the Force. Learning a valuable lesson about being a Jedi, the natives rewarded him with a violet-colored special crystal. He used this crystal to construct the lightsaber he had seen in his visions and it produced its distinctive violet blade."
So, imho, taking away Mace's purple saber would be an injustice to his character. :P lol
Anyway, that's just my two cents. XD