I used http://www.acrylicosvallejo.com/gb/water-stone-gb.html and GW dead grass.
I also used basing stamps from Happy Seppuku http://happyseppuku.com/Stamps.html to get the cobblestone effect on the base that Nico is standing on. I sculpted a gully whilst this was done and then poured Vallejo water in to the gulley.
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and thanks for all the great comments.