Oh man... I had this weird dream that I was at a she-Clinton rally, and all the signs -- big ones and small ones, wide and tall, held by one person or many all around me, even pinned on the walls around and behind the podium -- all suddenly turned red, and they had typical Communist slogans on them (mix of Russian, English, and Chinese), promoting Hillary in most distopian ways possible. One sign had the faces of Marx,
Engels, Lenin, Stalin, Mao, etc, all in succession as you tend to see at real Communist rallies in some combination, with Hillary following all of them.
Technically it's possible to make signs that look like normal Clinton campaign signs, but the top layer peals away to reveal another sign behind it. Not sure how cheap it would be to make, but definately cheaper than it would be for the event organizers to screen them out... But this is a "Photoshops" board, so... Let's see some ideas (original or existing if you can find them)!