When the well runs dry and the ideas won't flow, it's time to get out of your head. Really out of your head. I like walks. Rambling, long walks in places I haven't been. The point is to turn focus away from the critical voices yammering inside the skull. I play a game - looking for x number of things to see. Things to observe. From the macro - Some days there are great alpine glow photos. (Alpine glow on the Olympics here). To the micro - Some days it's nothing more than listening to the gentle cackle of a pair of crows courting one another in the trees. Or the little weird and wonderful things that happen closer to
In the bad old days before better living through chemistry made ironing work shirts a thing of the past, I would have my best writing breakthroughs while ironing (which I absolutely hated - ironing - not the ideas.) The task was mindless, but you had to pay attention so as not to burn down the house. Or permanently press your digits. Conscious mind got occupied with wrinkles. Creative mind churned in the background, kicking out little 'hey, what if' voices. The closest I get now, is through walking a couple of miles (which occupies the conscious mind) or via deliberate alpha state meditating.