Gaiman's Sandman..

[Aaron]

I could see it done in the form of Sin City (shorts) and in the Scope of The Lord of The Rings (twelve hours)..

I could see Del Toro doing some of the fairy stuff..
Maybe Wes Craven or Fincher doing the corinthian..
Sofia Coppalla doing some of the Death stuff..
Spielberg doing the funeral progression..
Whoever did the animation for Kid's Story on the animatrix doing Delerium.. or maybe the waking life dude..
Maybe Baz Luhrmann doing the Cain and Able stuff...

Actor's/Actresses?
Jim Caviezel as Dream? (he's got the vacant stare thing going for him.. though he is getting kind of old)
David Bowie (of thirty years ago) doing Lucifer..

..? Anyone?