This image is kind of creepy. I used a chemical process to make this cyanotype for a lesson I taught. The prep time was a lot, but it only takes about 15 minutes to expose these images.
First you make a collage, then get a transparency made. You put the chemically treated paper under the image and a glass sheet on top. Leave out in the sun and then rinse with water. Simple enough? Well it doesn't work as well when it's cloudy. So I put this one on top of a light in my professor's office. It worked surprisingly well!