Your best source for inspiration for RPG's?
The internet. I'm an idea sponge, it's my blessing and my curse. All it takes is a link to a video, a random piece of art, or a book/TV/movie recommendation, and I'm down the rabbit hole.
Unfortunately, I rarely maintain sufficient focus to see things through, so my attention is constantly bouncing from one cool thing to the next. The good news I retain a lot of it, so I can pull out something useful pretty much whenever I need it.