What about Opheodrys Aestivus? It's supposed to be some kind of "cornsnake" (not sure if that name is as extensive as the one we use in czech for this kind of snakes) and it's pretty and green ... very arboreal too, spending tons of time tangled in the branches, but not really "handling friendly" as I read they are pretty bitting prone ...
No idea if it would be suitable for your viv technical setup, but it's pretty and green and would go awesomely well with the "avatar-like" theme I think
No idea if it would be suitable for your viv technical setup, but it's pretty and green and would go awesomely well with the "avatar-like" theme I think