Would Advertisments on my Feet work?

During my summer vacation, my family and I went to some kind of a playhouse (I am not sure what to call it). It was a huge building with all sorts of toys, slides, trampolines and fun stuff for the kids. My two kids had a awesome time. At this playhouse, all visitors had to take off their shoes and because it was summer, most people had no socks on. After a little while, I found myself looking at feet. I usually don`t do that, but at this place I looked at them because I knew that everybody had to take off their shoes. At first I was only looking to see if someone was wearing shoes inside or not. But then, it got me thinking about a new method of advertising. What if I had advertisements on my feet, how many people would see them? [singlepic=13,400,254] It would be interesting to test this kind of advertising at the beach as well. The ad didn`t have to be big at all, just a small logo or a text or even a URL. Maybe people are staring more at feet than I have realized?