I was experimenting with giving meshes multiple uvmaps in Blender and cloning textures between them (kind of like cloning in photoshop/gimp, but 3D). I imported the marine's head model, which had the the top left texture to start with. I tweaked the meshwork a bit and gave it a full wrap uvmap instead, then cloned the texture across, resulting in the middle left image.
I then grabbed a picture of angelina jolie from google image, did a huge amount of tweaking on the mesh and then made a third, frontal uvmap which I mapped to the picture of her face. I then cloned from the original skin and the new angelina skin to form a composite image which is the one in the bottom left and the main pic.
Pretty good fun, but sadly my skills with airbrushing aren't good enough to complete the job. Maybe I should treat myself to a wacom.