As long as you're just talking temporary, I'd say it's up to you. Crape Myrtle seems like a good choice, lots of branches to choose from and small leaves to create the dappled light Cattleyas like. I'd avoid trees that shed a lot of branches like Pecans, Hickory, and some Oaks.
I have some in a fig tree, but I'll need to move them pretty soon as the figs ripen.