This is I believe, an improved version. By adding the substrate texture to 
the basal moss and by using two texture maps (one for the basal moss, one 
for the top moss, with an additional transparant component) I have brought 
back the necessary instances of the object to two instead of three, the 
second one slightly translated upwards.
By playing with the texture map settings it is possible to influence subtly 
the aspect of the moss and the presence of bare surfaces.

Next stage is wrapping this up into a macro.

Thomas

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