For those interested, I have investigated some  layered textures making 
use - one way or another - of object patterns, over a basic brown texture.

1 - Upper left: one single texture with an object_pattern;
2 - Upper right: two layered textures, each with a different object_pattern;
3 - Lower left: using a pigment_pattern to control two different 
object_patterns;
4 - Lower right: two layered textures, each with a pigment_pattern 
controlling an object_pattern.

2 and 4 have identical results, but 2 is simpler and more comprehensive 
in use. I guess that a large number of different texture possibilities 
can be derived from these examples.

I shall put the scene file in p.b.scene-files.

-- 
Thomas

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