The Cyanotype, or blue print process, was invented by Sir John Herschel in 1842, thus making it one of the very earliest photographic processes. It was also relatively quick and simple and Herschel used it to make copies of notes. The best known early proponent of cyanotypes was Anna Atkins who did a series of leaf prints and also published books utilizing the process. 
The chlorophyll process is an organic alternative photography process akin to the anthotype process. However, instead of printing on the crushed extract of fruit or plant matter, the prints are bleached by sunlight directly onto the surface of leaves using a positive. 
Van Dyke Brown is an early photographic printing process. The process was so named due to the similarity of the print color to that of a brown oil paint named for Flemish painter Van Dyck.