What if you took the avengers and sent them back into a fantasy universe? Maybe they would look something like DeviantArt user DenisM79‘s sketches?
It’s worth looking through his gallery as he has also done Rockabilly redesigns of Cat Woman and Bat Man.
And if that’s not cool enough for you how about these slightly more stylized fantasy Avengers by Another Deviant Art User theDURRRRIAN
