Make advertising placards saying that these are Patriotic Phones, as shown by their decoration and by the fact that they respect your privacy by not ringing, as no doubt the Founding Fathers would have preferred had there been telephones in those days. Then take them to the San Jose Flea Market, and sell them for a dollar apiece. Then again, there's always the Noble Cause of Artistic Endeavour. Using the handsets from the phones in pairs to form open or close angle brackets, construct an operative DTD declaration a la John Klassa.
Bonus points for having all the phones plugged into working lines, and having practiced in advance.
Record that and use it as scratch beats to mix an MP3 of someone pronouncing a rot13'd version of the DeCSS song. Try to make the raw off-hook recording four minutes and 33 seconds, for ironic historical reasons.