The photo to the right didn't start out as a a trick pic. It was taken accidentally on Enders Island as I was walking around snapping pictures. I turned and swung around and must have taken a picture while not aiming.... The frame captured the horizon and my hand, all out of scale... Serendipity!
It was subsequently finessed in the online photo editor "Picnik" using a Puzzle effect and a frame effect - two of the effects Google, (which owns Picnik) hasn't seen fit to port over to the Google Plus "Creative Kit" Unfortunately Picnik will close in April and we will be stuck with a much more limited array of possibilities than previously. Lately I've begun wondering if Picasa Web Gallerys are going away eventually as well, tucked into G+. I wouldn't mind but they always leave out some little functionality or other that I had admired and that worked well for me.