There are some graphic designers out there doing great work reimagining film posters. I just discovered the below for Casino, via Submitted for Your Perusal:

"Casino" poster by Ibraheem Youssef

(NB: it’s all the suits that Robert De Niro wears in the movie). It’s from this collection of Scorsese tributes.

The other person I know of who’s doing something like this is Olly Moss. He’s done a bunch of cool stuff, including imaginary Penguin Classics covers for video games. Here’s his movie poster for Charlie Chaplin’s The Great Dictator:

"The Great Dictator" poster by Olly Moss