Yeah, I agree with the tree-trunk comment. That's because of laziness! The game engine is working really well, so I want throw half-done art resources in there to get it moving. I was unhappy with my one 'curve' of canyon, which alone looks like a tree trunk... but I needed 640 pixels of repeatable scrolling because I was hungry to get back at the code.
This is by far the worse piece of art yet to grace this project, so I'll get around to showing you guys cooler stuff soon.