Those are pretty damned awesome. Cagney-Hulk and Gable-Iron Man are my favorites. And I can just hear Cary Grant saying: "Why, those criminals are a cowardly, superstitious lot! So, my disguise must strike terror in their dark, little hearts. I'll become a creature of the night, that's what I'll do! Black, terrible..."
The obvious choice for the Joker is Conrad Veidt (probably best known for playing the German Major Strasser in Casablanca): Why is he the obvious choice? Because years earlier, Veidt made a film called The Man Who Laughs, about a man with a face that is disfigured into a permanent grin. And his appearance in that film *IS* what inspired the look of the Joker: