Maciej Kuciara, Art Director/Concept Artist at Crytek, posted these spiffy pics to ConceptArt.org forums and we're re-posting some of them here because they smack of Frank Frazetta... and awesomeness!
Find the rest here. And for the record, no, these aren't Crysis concept art sketches. I think the ninja chick should've tipped you off if nothing else.
But still, I bet there could be a "cry" in the title of all of these would-be games. Can you name them all?