How can I make a good-looking path?

Hey all :)

I was wondering how I would go about making a good-looking path like the one in this video? http://www.youtube.com/watch?v=M7VVaIMA3wg

I have a seamless texture of cobblestone I got from the Internet and I think I need a bump map. I basically put the same image in Photoshop, desaturated it, inverted it and changed the contrast and brightness levels. I then imported both pictures into Unity and selected the normal texture as the road and the black and white image as the bump map, but it doesn't look bumpy at all. It still looks fairly flat.

How would I go about making a floor like this? :)