There is a definite process to inspiration, this article might be of interest to you:
Annals of Science: The Eureka Hunt : The New Yorker
contains almost but not quite step by step instructions for generating Eureka Moments in ones brain.
ETA: They seem to have it behind a paywall. Sorry. I will try to summarize it a bit later one, gotta run and get this kid in bed now.
ETA2: So here's how inspiration works:
1) Think furiously about the problem.
2) Gather relevant information, data, ideas, etc etc.
Run around and around on 1) and 2) for a while. Fill your brain up with your thoughts on the problem, and on material that might be relevant to solving it. Now move on to:
3) relax, let the mind drift. Take a shower, take a walk, take a nap. Consciously walk away from the problem for a bit.
4) gently, ever so gently, gnaw on the problem a little.
Hang around in the 3)/4) zone for a while. A few hours, a few days. Sometimes just a few minutes. If no "EUREKA!" moment occurs, return to steps 1) and 2). What you're doing is filling your brain up with raw material in steps 1 and 2, and then letting your unconscious mind gnaw on it, doing a massive parallel computation, in steps 3 and 4. If you draw a blank, return to 1 and 2 and dump in more grist for the mill.
There are pretty firm neurological bases for this process. It works. Or rather, nothing else works, but this might.
What this might translate into for you is to alternate:
1) worrying about how to make a really GOOD and INTERESTING picture or set of pictures.
2a) looking at other people's pictures and reading other people's writing about how the approach making pictures.
2b) looking at the world of thing you could take pictures of, and things you might want your pictures to say, mean, show, reveal, comment on, etc.
alternated with:
3) nap/shower/walk
4) gently think 'hmm, what kind of a picture should I take?'
If you're lucky, you'll be thinking of something else and it will suddenly hit you what you ought to be doing with the camera.