I'm building a custom enclosure for the future home of a baby albino burm here: http://ball-pythons.net/forums/showthread.php?t=94172 the enclosure is a very vertical enclosure and I want to put something in that will add a lot of interest to my enclosure. My friend was thinking a few brightly colored tree frogs and whatnot. I would love to do that, but I would like to know if any could hurt the snake if he got hungry and decided to eat one (he's a baby right now), but I would like to have a bit of diversity in there since it's a big enclosure and such a prominent display in my house. What would you guys recommend that is relatively hardy, long-lived, and cheap that is also non-intrusive to the snake that would make my enclosure a point of interest?

p.s. Forgive my noobishness, I'm still learning the terms and nomenclature of snake ownership so it's hard to search for relevant topics.