Types of Green Snakes?

[Serpento]

Hi everyone! This is my first post and I'm here to ask about the types of green snake species. My mom recently allowed me to get another snake, and she wondered if there were any green ball pythons (which I really like, by the way). She knows about green tree pythons and emerald tree boas, although she prefers snakes with more friendly dispositions. There are also rough and smooth green snakes, but those are a little smaller than what we're looking for, plus I hear they're usually wild caught. She really likes the bright greens of the snakes I've already listed, although an olive green color would be pretty too. Obviously, we're going to do a lot more research into anything before buying anything right out, but just for future reference, what other types of green snakes are there out there?