Specifies the URL or the file name of the image to use as the fill texture.
If you want to use an image from a local file system, you can specify the file name either as relative path:
fill-texture : Textures/ForestNoiseLight.jpg
in which case Maperitive will use its installation directory as the base directory to look for the image file, or as an absolute path:
fill-texture : d:\Textures\ForestNoiseLight.jpg
You can also use an image from the Web:
fill-texture : http://somewhere.com/textures/mytexture.png
Maperitive comes with some sample texture images, which are stored in the Textures directory.