That article only has the one picture. I saw some others online (misplaced the bookmark, sadly) showing more of the signs, like the Hypnotoad sign, one held by a Bender reading "KILL ALL HUMANS", one reading, "ROBIN 22:4 - Yea, though I walk through the valley of the shadow of death, I shall fear no evil, for THE DARK KNIGHT is with me!", and my personal favorite, someone dressed as Buddy Christ from Dogma with a sign reading, "GOD LOVES EVERYBODY".
Sadly, no one used the slogans Joel Watson came up with for his Hijinks Ensue strip - I quite liked "ADAMA HATES CYLONS", and the quote from the Book of J'onn J'onzz...
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.