Today i found a quite interesting tool.
It's called ShaderMap 2. It can ganerate Normal, Displacement, Specular, AO by using a normal picture.
Compared to the quite well known CrazyBump, it creates the same results, but is cheaper and still in active development.
Thought you might be interested in something to get yourself such maps for rendering.
(my example below uses one of Winows' examplepictures, this one is a quick one)
and how it looks i.e. in NeoAxis:
Their page:
http://shadermap.com/home/edit:
OH, and editing normals is quite handy, too
http://www.youtube.com/watch?v=BcASXxF7Dvogreetings
Rackscha