All my campaigns use this weird inspiration called: not based on a movie or book plot. Because those generally make for terrible railroad "campaigns" at best.

I look for inspiration in setting or events to design either adventure sites and actual campaigns. I look for inspiration from organization concepts for Big Bad Evil Organizations. Those can be real or stolen from books or movies, but honestly it's best to just steal the idea them direct from work someone else has already done for an RPGs.

I can see Episodic TV shows with "adventure of the episode" vaguely working. But it'd need to be very loosely inspired. But since my favorite shows were Futurama and Family Guy, I've never bothered.