Stone wall with color, diffuse, displacement and a normal map on bump channel.
That's a little tool I'm using to create all the maps I needed. It was there on my hard drive over years and never used it once. Today I needed to create normal maps and first I visited the Nvidia's site but their Phötöshöp plugin was not there anymore. And I remembered the Shadermap Pro - gave it a try and works like a charm.
"Cobble stone streets in the heat of July..." - Rua
Correctly generated maps are crucial for realism. I realized my old-fashioned method to create them on Photoshop wasn't that good. Again, maps generated from a color/diffuse image with ShaderMap Pro, rendered with Cinema 4D' Advanced Renderer.