The obvious answer here is try cyanotypes. Mix potassium ferricyanide with ferric ammonium citrate in distilled water. Coat some paper with the solution, and wait for it to dry. Get a negative the size of print you wish to make and put the negative on the paper, then place the two in the sun, or other ultraviolet light source. Depending on your negative, exposure time is 10 minutes, to three hours. Practice makes perfect. No silver involved. It's iron based. The resulting image is very stable if kept out of direct sunlight. The particles are actually called Prussian Blue. But, you do have to deal with blue images.