Dragons' teeth make for the best climbing equipment, y'know.
Weird situation! I did some concept art back in 2008 for an animated film coming out... Soon, and I'm finally allowed to show it off though I can't technically say what it's for. I'm pretty confident none of this made it into the final cut, but I'm sure you can figure it out.
Enjoy! Glad I can finally show this stuff, even if it's older. -C