I always read that Dooku was going to have a curved blade (obviously misinformation based upon truth - it was the hilt that was curved).
When I made the yellow saber, there was a residual red flicker here and there that I couldn't get rid of to save my life. When I looked at it frame by frame, it was gone. Put it into motion and there it was. It kind of made the saber look like a flaming sword.
I read about the flame saber on a posting here later on.