This picture shows one of the hebes with a small sized leaf but some varieties have smaller leaves more tightly clustered.

By chance, this picture also shows an experimental length of expanded polystyrene quickly carved with a standard soldering iron (not recommended) sloshed with masonry paint and posed to see if the idea was at all worth developing. I believe that it is but with the proper tools, after sketching the stone pattern on the poly and, most of all, using a darker paint with more colour variations.

Dai Pajero