We designed a window graphic for this medical group in Colorado in an effort help differentiate it from its retail neighbors—and promote the clinic. Walk-in business increased by 333% the first two months, and those who set up appointments because they saw the sign while driving by went up by 380%.

If you’re spending money on media buys but not looking at how well your own signage is working, maybe it’s time to take a second look. It could be your most effective—and least expensive—ad ever.