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I'm no photoshop guru (!) but I try this sort of thing once in a while. It attempts to blend two images together so that the moon "creates" a silhouette of some foreground object. I just use blending modes, but there must be better ways to do it that are more precise. I'm certainly open to suggestion to improve it or do it better.
Anyway, here's a result:
dinosaur by moonlight by beanp, on Flickr
Thank you for looking and any comments.