Already mentioned, Eunectes murinus youngster pictured with notaeus and papuana during group bath:
Liasis(Apodora) papuana can be rather green when the mood suits them:
Sanzinia madagascariensis has a pretty stunning green phase. They're scooped up quick when available so I only have a picture of the mandarin phase:
Some Thamnophis sirtalis ssp can be very green too. I only have infernalis so you'll have to google "green garter" to find pictures.
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