In many service businesses there are before and after photos, showing visual proof of the value for the service. One of my clients has a gum company and they came up with the clever idea of letting customers upload their own photos to be used on the cover of the gum packaging. It all started with a Baseball theme, but has since morphed into all sports and just for fun.
Here are several examples of their before and after photos to give you an idea:
They say that a picture is worth a thousand words, so if your business produces something that is visual, then go ahead and show it off with a photo on your web site.