The cyanotype process was one of the first non-silver technologies used to create photographic images. Originally created in the 1840's, it was not utilized in mainstream photography, due to the burn-in time but instead was used as a coping technique in reproductions of large architectural and mechanical drawings. This blue background paper called cyanotype was used so often that the term “blueprint(s)” came be used when describing a draft of a building. This day-in-age we use large plotters which is pretty much just a large printer.
For more images check out http://www.pinterest.com/farrownick/cyanotype-project/