Do you believe in magic? How about this:

A material that won't corrode, is super flexible, lightweight yet strong — and the most abundant metal in the Earth's crust. Perhaps it's no surprise that versatile aluminum has the atomic number lucky 13. And aluminum is a team player: it combines in nature with over 270 different minerals.

As everyone knows, one of the most popular uses for aluminum is beverage cans — so if you were really enterprising, you could save your soda cans, hammer them flat, whitewash the existing message and create your own signage! But that's an awful lot of labor, which might be better spent running your business or campaign.