We have several large silos near the rodside. Each week during the year, we write a latin phrase in chalk and the kids draw a mural of some sort. It stays until the rain washes it off and all the motorists slow down to admire my kids artwork each week. Starting September I changed the theme of the slogans to latin phrases which lambaste Kerry in the body of the message. Stuff like Kerry is a french bastard(illegitimi Kerry francaise) and Kerry is a stupid french cow, Kerry's a french pancake and so on.....
People love it or hate it. Either way they can't get near it without getting mauled by livestock guardian dogs and beating a high voltage livestock fence.
I also used livestock marker crayons to paint the belly of my plane with a Bush 2004 slogan in 4' letters. It will wash off with a little solvent and hair conditioner. It reads real good from as high as 2000'.