Cyanotypes are an old photographic process dating back to the mid 1800's. By mixing two chemicals and water together you create a light sensitive solution. Applied to an appropriate surface, a negative is placed on the dried substrate, exposed to the sun (or any UV source) and developed in water producing an image with varying shades of blue. The process is relatively simple and no darkroom is needed. Basic instructions here. I find them to be a nice compliment for my subject matter and enjoy the tactile experience when creating them.
Gum printing is a photographic technique dating back to the mid 1800's. The process is very simple but, deceptively so. A light sensitive solution typically made of watercolor pigments, gum arabic and potassium dichromate is applied to watercolor paper. A negative is placed on the dried paper, exposed to the sun (or any UV source) and developed in water.
Achieving consistency is a big challenge, one that I'm still trying to attain. However, using a UV exposure unit can help with that problem if you want to spend the money for one. In any case, they can be quite beautiful and you can get very creative with them using color separations, unique color combinations or a variety of other methods. There is no definitive process and experimentation and patience are your best tools. Basic introduction to the process here.
Basically with image transfers you make a xerox copy of an image and adhere it to a surface coated with clear acrylic medium. Once it dries, you moisten it with water and rub away the paper and the toner stays on the surface (the image is adhered to the acrylic). It's never perfect which is really what attracts me to the process, I love the distressed look.
Below are images I made using Deep Dream software. With it, you select an image and a set of filters and the software looks for images and shapes it has been taught to recognize within that image. Next, you can take that altered image and feed it to the software again and the results become more surreal the more times you process an image. Sometimes I go one time, others many times...whatever seems right. It's easy for the process to become gimmicky.