Please, no more lightsaber colors - I still advocate for blue and red ONLY in the PT, thus keeping the symbolism of Luke's green one in ROTJ - a new color for a new type of Jedi. But I do like the idea of Dooku having a purple lightsaber, to keep his nature more ambiguous (though I suppose, if everyone else was blue, green would work for him as well).
I still haven't watched The Clone Wars, but IIRC there's someone doing exactly what you suggest over at Fanedit.org. I could be wrong, though, it might've just been an idea someone came up with.