Kor, a rainbowface was in "Invasion of the Tinysauruses." It kind of irked me, because even though the "rainbowfaces" are an actual dinosaur species (Gallimimus most likely), I thought it would have been better if the species had been restricted to the two rainbowfaces from the 7th movie. I think this way mainly because they were aliens, and when I first saw the Great Valley rainbowface I was like "LOL WUT?"
As for the ones from the 7th movie, I love them. They were so outcasted, open-minded and mysterious.