Hi all, thanks for the comments
EBAndrew, I have displaced the moss to make it a bit more.... mossier, good call
Mahnmut, Oranged the pond muck, and you are right, it does look better, though its a right swine to get it bright, but i'm working on it. I'm also going to tweak the scum around the edge to try to get a bit of orange into that too. Good call
mhaze, Hmmm, industrial scrap! I'm going to give it a go, see what I can come up with. Good thinking
calico. True, but I didn't want to go mad with the displacement and especially not the colour as most stone I come across (and I come across a lot, working for a geotechnical company) is rather grey and boring to look at.
Miles