Some time ago, in response to the popular "Marriage = (man) + (woman)" bumper stickers some right-wing conservative religious groups have been handing out, I designed a poly-friendly version of the same thing. A bunch of people have asked me when I'm going to make the bumper stickers available for real, so I've finally gotten off my ass and done it.
The bumper stickers are available from my small Cafe Press store. If you click on the picture below, you'll go right to the bumper sticker itself:
(Note that the URL is not part of the actual bumper sticker design and does not appear on the bumper sticker.) There are a handful of other poly-related things on the Cafe Press store which I can't actually screen print myself.