Looks like a waterfall, running water in the foreground, some leafless trees in the back, and I think I even see some skulls/heads piled on the near bank of the water at the bottom, a guy with a sword on the far bank, and a dude hanging from one of the trees. That, or this is the most fucked up Rorschach inkblot ever.
The picture, on its own, is kind of intriguing. It hints more than anything. If that background were moving/animated, it might make it a whole lot harder to read, but that might also add an element of menace to the feel of the game. If you were toodling along, just barely paying attention, and all of a sudden, "oh, whoa, that dude is hanging there. Are those effing skulls?" it could be kind of fun.
I'd say do a quick and small prototype to nail down the feel and show it to some folks. If it works, run with it. I would give it a play.