The red lightsaber angle is quite interesting. Does the saber stay forever tainted? I assume not, since you say that it will happen several times in Episode 3. But what if it was a permanent change? This would be a really interesting dynamic from a storytelling perspective, as Anakin would have to get rid of the saber before any more Jedi see him using a tainted blade (and he does). It’s potentially even more interesting in Episode 3 since that saber in ANH is blue. I imagine an effect where the blade starts flickering between its original color and red when a person is on the edge of the Dark Side, and it could do this several times in Episode 3. But it is never permanently tainted, implying that Padme is telling the truth and Anakin hasn’t turned fully evil at any point.

Finally, how interesting would it be to have Luke’s green saber turn red in his final fight with Vader, and have this be part of his realization that he must turn away from it now and throw away this symbol of violence?