Ideas are like rabbits. You get a couple and learn how to handle them, and pretty soon you have a dozen.
~ John Steinbeck
And they're a dime a dozen, ideas. It's what you do with them that matters. I remember when I put together my anthology of women writing about baseball (Diamonds Are a Girl's Best Friend) & thinking that if I hadn't done it, at some point someone else would have. It wasn't a unique idea, just one that I carried through. I'm sure others thought of it before I did, for that matter.
Every day I try to think of a project. Most I'll never do, but the more ideas, the more ideas. Multiplying like rabbits.