Pick a story/series and go with it. Dark Tower, It, Salem’s Lot, or potentially The Stand would all be great. But trying to cram multiple storylines into one game would not work well (and yeah, I know Mr. King himself has flirted with this at times by retconning his various stories together, but doesn’t mean it’s a good idea in a pinball machine).
I agree 100% that movie clip art would be terrible. Bring in an illustrator from one of his books, or someone else that can draw horror.