Ok, here is a window graphic at  a restaurant I have been going to for many years, Pho Hoa on SR7 in Tamarac. It's a really good Vietnamese place that consistently serves terrific food at fair prices.

Like many places  to dine in South Florida, it's in a strip mall back off  the road and it has very little signage. Posting a menu makes sense, because people in the strip mall  are walking by all the time. This menu has been up for at least 5 years, and has completly faded to blue from exposure to the sun. It's also placed inside the window, so the glare and window tint makes it hard to read. This is a shame, because printing this on an exterior-grade window vinyl and mounting it too the window is simple and inexpensive. The result would be an appetizing graphic that would catch people attention and draw them in. The food is so good that they would become steady customers.