Hi Thomas, glad to see you are back on this.  I couldn't resist playing 
around a bit because I thought the antique ruins an interesting subject 
and also I wanted to throw one more idea into your toolkit.
I wanted to play with a method for applying texture which would vary 
with the surface.  As you know, one of the usual ways used is the slope 
pattern, another is to use methods that share the same pattern for both 
distorting a surface (either perturbing the normals or actual 
isosurface), and texturing the surface.  Another method I wanted to try 
was to use the average of a number of object patterns based on the 
object being textured.  Here I used a cylinder of diameter less than 
that of the column and averaged a number of scale changes to create some 
grunge in the column flutes.  I used your lichen pattern for the grunge 
just because it was handy.  I hope this wasn't too presumptuous on my part.

-Jim

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