I doubt it, seeing that Anakin Skywalker / Darth Vader is the ONLY Jedi/Sith who's ever done it. He definitely represents good and evil, but also redeemable, given the right circumstances. Deep down, Luke knew all too well that Anakin wasn't completely gone. It was love and compassion that brought Anakin back.
According to the Star Wars Blueprints: The Ultimate Collection factbook, C-3PO has a Mk.2 Myriad Visual System that gives him vision equivalent to that of a human. This presumably includes colour-vision.
A salvaged MK. 2 Myriad Visual System allows C-3PO to see by human and various alien standards.
The Star Wars: The Visual Encyclopedia factbook ...