Something in my reading of Gravity’s Rainbow this morning reminded me of Pynchon’s frequent use of the color green and suggested it might have to do with paranormal auras that are colored green; however, performing a casual search for what a green aura might entail, I find it might entail just about anything — there are also the shades of green to consider.
I’m not sure if green is used positively, negatively or ambiguously in Pynchon’s work. Certainly some of the time it is meant to indicate American dollars and is, at a minimum, non-positive.