I had two images lying around in my random folder for months. One was a graffiti wall I photographed knowing someday I would use it as a texture background. Then I had this kind of wide-eyed pelican photo. This afternoon I thought to combine them for a psychedelic looking fine art photograph. In Photoshop I placed the graffiti wall image right over the pelican photo. Then using a layer mask I was able to brush away the wall to reveal the pelican underneath, as well as choosing the blend mode for the overall look. This is actually a fairly simple Photoshop skill. To get more of an idea of how the combo process works, check out this blog post.