Jackie over at Au Currant just put up her fake anti-war posters, which didn't make it under the radar for whatever reason. No permalink, but scroll down to the three thumbnails. I think this one is my favorite.
And to answer her question about this poster, I just got an unsolicited confirmation from creator Jerry Joplin that it is indeed a prank. (Notice how all the oil companies are French? Le d'oh!) When it's pulled from the contest page, which it will be as soon as Melanie Goux reads this, you can check it out here. It's a little blurrier, but that's how it was originally. Goux cleaned it up and took off the URL at the bottom, looks like. (Thanks for the image hosting, Michele!)