Here's a list I compiled of themes I'd find interesting. Some of these are odd and would probably sell poorly and be a bad business decision for Stern. But I'd happily put any of these in my basement.
Generally, I see these as current classics, cult classics, and things that will age well.
Blade Runner, original
Monty Python (MM, I know)
Pulp Fiction, Reservoir dogs or maybe Quentin Tarantino overall?
Evil Dead / Army of Darkness
Shaun of the Dead
Mel Brooks movies
These are probably too bizarre, but I'll include these here just for me:
Blues, King Biscuit Flour Hour
Frank Lloyd Wright
Vincent Van Gogh
Mystery Science Theater 3000
Standup comedy, not sure how this would work in pinball, but my favorites are: Andy Kaufman, Reggie Watts, Sarah Silverman, Mitch Hedberg, Richard Pryor, George Carlin, Bo Burnham, Eddie Izzard