I just revisited this revived thread and realized that Green is talking about the pink snow on Mt. Shuksan. Actually, that is a reflection from a gaudy sunset -- the snow on that mountain was white, with strong blue tones at the toes of the glaciers.
But we really have seen pink snow -- this was taken at 11,000 feet in the Sierra, north of Tioga Pass:
Those colors are not retouched at all -- the ice in the pond is turquoise, and the snow is pink due to that algae. It is hard to imagine a plant that photosynthesizes but is not green. And a ranger told us that if we ever needed to use that snow for drinking water, we could do so safely. (Since we don't backpack, that is very unlikely.)