They could just use pages from the Koran to wipe their butts, then stick them to Plexiglas and call it art. Surely that would be acceptable. 
Or claim that this is the free exercise of
their religion, as they see it. Now that could get interesting...
Miskie's got a pretty good idea. It makes noise, attracts attention (which is the point), and just how could anyone cite them for using a woodchipper/shredders on their own property? Not that I think they care a tinker's damn about the fines for littering or having a bonfire without a permit. They just need to be worried about being shut down. But shredders....what can anyone say? And if some well-burnt bacon goes in with the Korans...what's the ordinance in Gainesville against shredding bacon bits?
This would make possibly even better tv than pulling a Savanarola (you
know the propaganda media will make that absurd analogy and take it seriously; I'm just being a bit glib).