Here's a neat website where you can create your own church sign messages (or any other messages on signs). Check out the one I created below:
To create your own church signs, go to http://www.says-it.com/churchsigns.
With a little adaptation, you could create other signs besides church signs. Perhaps something to advertise an upcoming seminar, teleseminar, or other event.
Here's an example I created:
And here's another sign I created to advertise my publishing company's address: