https://www.youtube.com/watch?v=UMbj77t1NMo
When I make my mud I used Plaster and Cheap acrylic paint out of a tube with water, I also add loose leaf tea as it gives it body and texture, a bit of coffee granules does'nt go amiss either..
Then with stones pushed into it and some of that self adhesive grass tufts... voila..


