Ok shedofjoy, tried out your mud shader combinations on V3 and I must say that I am rather impressed.  Now I'm going to put you on the spot,  which nodes control splatter intensities, color variations and size of the mud drops?  And exactly what R,G,B combinations were used in your post and suggested combinations for creating custom mud?  I think a small tutorial is in order to help newbie understand the complexity of the nobe interactions in the Material Room.