Well, the idea found it's source in the welcome thread where I posted the first map ever I draw for an adventure.
The adventure is "The Mask of Marruk" from Monkeygod Enterprises.
There is a map of the city Fanghorn View in the book, drawn with Campaign Cartographer 2.
I thought I could make it better because the city looked a little sterile and draw it with Microstation, a CAD-program (Like AutoCAD)
The city looked better, but it is lacking texture.
After doing the GIMP tutorial from ROBA here I thought I could improve my GIMP abilities by using it for adding texture to my city.
I will post here for showing you the progress.
Here how I started: