Fred Lebain's photographic series A Springtime in New York features his own photos, inside his own photos. He took a bunch of beautiful, but mundane photos of New York and had them printed on large, glossy posters. He then returned to the setting of each photo and took them again, but this time with the print out of the original photo inside a wider shot. Each photo has its own unique imperfection to hint at the photo within the photo.
I like this concept a lot. There is a stupidly simple brilliance that makes it captivating.