Hi Skel,
I went for green in the end, not a colour I am that familiar with in terms of what works but found a nice ork skin tutorial that gave me a starting point for colours that blend well.
As to more vegetation, I am going to add some clump foliage, moss effect stuff, the type that comes in big bags for model railways and look like fungus\stringy lichen.
Then some small grass tufts here and there. This was really a whim entry so its a bit of an experiment
EDIT: Having had a good look at research examples, grass seems to be unlikely on a jungle floor, so I am going to add more small branch dead fall, some pebbles and add moss to the deadfall/stones to add more green to the floor and bring a bit more life to it all.
I had looked at adding more banana leaves to blend the Lictor in, but I am aware that if its too covered it wont be the main centre piece, so I am sticking with low lying vegetation and the lector and tree stump being the main draw for the eyes.
Hopefully get him finished this weekend.