I can remember an article ( back in the 70's) about a man in Vermont, who built a "green" house. He designed it so the furnace burned paper- and had a barn to store his junk mail in the summer, which he used to heat the house all winter. Seems he liked the idea of the post office delivering his fuel to him throughtout the year.
He did sign up for every free mailing and catalog he could- I don't know if the article blew his cover or not.