I sometimes get asked about ideas--where they come from, how I generate them--and I usually say they just come. Stay open, and they come. (Furthermore, I say, ideas aren't really the important part. They're a dime a dozen. The important part is what you do with them.)
Ironically, I've recently had a bear of a time coming up with ideas for these pieces. Pretty much every day I've been on the sheer cliff-edge of disaster, and it's getting a little old.
Something isn't working. What am I not seeing that I need to see?