Yeah, I hear that.
I would have liked a few extra colours, so that I could manage the lightsabers a bit better. It is very difficult to tell the difference between everyone's weapon when they all have one of three colours and everyone has two!
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I like the green and blue thing mainly because of When Anakin did it,and it seems the most real way a jedi would use duals,but my three favorite dual combos are(in no respective order):
Blue and Silver
Blue and Green
Blue and Violet
so basically I use blue because of the essence it has,it,to me,shows a strong,solid,color.