Well, here's something a little different which was dug up by JGonzo at the Capcom*Unity: an ice stage from "Nezumiman," a "Mega Man tribute with rats, jellyfish, and refrigerators that run."
Interesting lot of villains... a kangaroo named "Usagi?" And do I even want to know what is "milky" about "Milky Nezumi?" At least "Dragon Nezumi" is pretty awesome.
As for the stage itself, it does have some pretty clever design elements which make sense for Mega Man, though I'm not sure I've seen them used just as they are here.