From a link on G+, I was propelled into the galleries of Alex Mitchell (aka genesischant on deviantART artist and animator (writer and artist for Space Ninja). Mitchell does a lot of redesigning characters for other genres, such as a chambara Justice League (of which the Steel Man/Superman is pictured to the right).
He has also done 1930s versions of the JLA as vigilante gang busters, while the Secret Society (of supervillains) are all mob bosses. The X-Men as Victorian-era spiritualist/occult based heroes and much much more.
So much inspiration here for superhero games, Legend of the Five Rings, steampunk, Victorian-era games and more. Go take a look and see what takes your fancy.
Oh, and he even has a piece inspired from back when he played D&D.