I heard this quote today from author Madeleine L"Engle: "Inspiration comes during writing not before."
As I thought about it, this applies to artists as well: inspiration comes during the painting, drawing, printing, sculpting etc. not before.
This happens to me often. As I enter the studio I really have nothing specific in mind to create, but as soon as a color or mark is down on the surface, I am "inspired" to add another color or mark. Each one builds on the next, and soon a composition appears, and I say, "Wow, looked what happened."