The Best That Might Have Been?

An internet meme I've seen crop up over the last couple of months has been the re-imagination of movie posters to show some ways that famous movies might have looked if they had been made in different times. What stars would have been cast? What would the promotional art look like? How would a movie's central concepts have been expressed in terms of different marketing schemes? Some of them have been well-done and some of them not so much, but the ones here look very realistic. I'd probably want to see some of those movies even though I hadn't any wish to see them as they actually existed.