Maybe you've even been inspired by them - church signs. Beliefnet has a whole gallery of usually funny and sometimes poignant signs from around the country.
I drive by Shreve City Baptist Church on a regular basis, and they usually have something out front that makes me smile on their sign. My favorite was a couple of years ago, when the brick mounting for the sign was damaged. (I can't remember if someone ran into it or what) But the new board still proudly proclaimed: "Sign broke. Message inside."