Are you talking older blueprints that are actually blue, or modern blueprints that are actually white? Modern "blueprints" are essentially like anything else you would print out on your computer at will, just on a larger plotter (printer) than most folks have at home. Older blueprints are, by their nature, also all reproductions of the original hand-drawn plans, but are more like oversized versions of the mimeograph tests and worksheets we used to get school. I imagine even these could be scanned today and reprinted in color (there goes all the blue ink) to produce something that would be indistinguishable in an internet listing until you had out hand.
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