I consider that when we really step into an area with both feet and live in that realm, ideas just are not hard to come up with because we immerse ourselves in what we have chosen to do. It is, to me, one of the key ingredients of creativity. You can't just skim across, you have to get in and swim! (I'm hopelessly addicted to analogies as you see!).
This is why I never run out of ideas. They come faster than I can do anything about many of them! Now executing them is something else again!