Well I'm okay with Christie, but Lisa's color is red. She is the real pom pom girl in the cast, and she ends up with the most boring color... or Helena's color now that I remember.
Well, black & white are surely Christie's colors... about Lisa, after that her favourite red color was taken by Lei Fang, sincerely I'm not able to indicate another color that could suit her: I want say, Kokoro's cheerleader one is fuchsia, so surely a characteristic color that anyway seems me a random choice for the young geisha.
So considering the neutral status of black and white, I think that in the end was the better choice for Lisa.
PS: Personally I would give back black & white to Helena (together with Cristie), yellow to Lei Fang from Helena, red to Lisa from Lei Fang, and changed fuchsia with orange for Kokoro, just for at least respecting the favourite colors of every girls.
However Sarah and Pai' swimsuit choices are really good: the first seems to be a fusion between Tina's "Pleyone" and Ayane's "Nixe", the second is Lei Fang's "Finch"