There is a single yellow Battle Droid in the Arena. He's visable for a single shot, in which Mace cuts him in half. I was looking for a screen grab of the shot, but instead had to use part of the cover from a Boba Fett novel. There are also Pilot Battle droids, which can be seen in the hanger when Nute Gunray leaves in his shuttle. They, however, are still white.
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