I came onto this page of Chris Jordan, who is not a photographer, but an artist who is making huge artwork from photographs and other pictures. On first notice these pictures seem just normal, maybe a little unusual. You have to click into the picture and the zoom starts. After some time it turns out that the whole picture is made out of thousands of pictures of some other objects. Fascinating.
Especially have a look at
Running the Numbers and Running the Numbers II, which all bear a special message.