MadPriest in running a bus slogan contest.
In England, Wales and Scotland, a group of atheists bought ad space on buses and bus shelters saying "there is probably no God. Now stop worrying and start enjoying your life."
It was a only a matter of time before Christian groups starting fighting back with ads of their own. Come to think of it, it was only a matter of time before some parody appeared.
Go here and see how your own ideas look on a bus ad. The essential formula is this: