I tried to photograph with a double exposure. It's a special reception at the photography, when same frame photographed several times ... So it's not photoshop. For example, for the first photo we shot for the beginning Irina and later a flower. Both images are underexposed and shot on a single frame of film. As a result, the image is normally exposed in the colored areas. If you are interested, the article about it in Wikipedia here. Some shots made in the usual way.
This image (below) is a double exposure, too. I have a mirror at home with large bevels on the sides. It gives the rainbow as a prism.
...and this one (below) is also a double exposure.
At the end, a couple photos in the funny wig.