Don't laugh at Free Coroplas Day. I used to rent a house out in the country that had a pole barn behind it with no walls. I walled half of in in with 4x8 campaign signs. Didn't like the way it looked like coro so I got a truckload of old campaign signs (thanks to our city sanitation department) split them in half, and layered them over the 4x8s so they looked like cedar shakes.
Looked awesome from the street.....up close, not so much but it kept my tools and lawnmower dry.