Wikipedia describes step and repeat banners quite well: “A step and repeat banner is a publicity backdrop used primarily for event photography, printed with a repeating pattern such that brand logos or emblems are visible in photographs of the individuals standing in front of it.”
So, here’s an idea for your shop . . . through your mailing list or any other method you have for reaching customers, promote the idea that at their next trade show or event, they set up a step and repeat banner and have a photographer shoot pictures of visitors in front of it. Then they should email the images to these visitors and encourage them to post the images on their social networks, thus having their logos or emblems displayed. Knowing how vain so many people are and how readily they’ll post pictures of themselves (especially with a “Hollywood” type step and repeats backdrop) it seems like a sure thing.
The whole point of course is that your shop will produce the step and repeat banners.