waruikazi
Legendary
Some Boiga might be up there. I suspect it would have to be an elapid or colubrid. I used to have a vivid orange Keelback, and I've seen a few of them.
Interesting snakes Thanks for indulging me I think Shane's Taipan gets my vote for the most orange of the thread's pictures so far.
I did catch a banded tree snake that was almost completely orange, it had a few small blotches of cream through its body. But i never took any pics of it.