Depends what sort of marble you are wanting.
Try this;
Graveyard earth base
highlighted bleached bone
Then try glazing some very thin streaks in whatever colour you like - I used dark flesh I think for mine - do it lightly though so that you hardly see it.
Once that has dried, do some more lines but undiluted so that you can see them properly, but don\'t do as many.
Also, use another colour such as scorched brown to follow the lines - don\'t worry about being exact though, so long as they follow the curves and bends of the previous lines....
It\'s so hard to describe in words really...
Also - when you have something you\'re pleased with, cover with gloss varnish
