Backgrounds for display tanks

Does anyone know any good websites/places to buy "forest-ish" backgrounds for a 20L tank? This is the last thing I have to do to finish my cornsnakes enclosure and the only backdrops I can find are fish tank or that beige "rock" style, but that's not what I'm looking for. I'm pretty flexible on the look, but fish swimming behind my snake doesn't really do it for me.

Here is his cage as of now: http://filebox.vt.edu/users/aharcler...n/IMG_0222.jpg

try www.drfostersmith.com or Google Dr. Foster and Smith