Yes, and fairly often. The latest? Today. I was looking for a couple of books I haven't consciously seen in a couple of months. So I said to myself, where are they? And a picture popped out, and voila, that was exactly where they were. It works most of the time - say, 95% of the time I find my lost object about 5 seconds after I ask the question.
How do I do it? The only answer I can really give is that I allow myself to follow my hunches, no matter how odd they may seem at the time. And that isn't just when I'm looking for a lost object, or am consciously seeking some kind of answer out. I follow my hunches when they're spontaneously generated as well. I think that's a key to making them work.