ntoadeath (Over a year ago): hey fudgeownedyou31 (nice name btw ) im not entirely sure what you mean by "mud effect" but on the model i used a lot of black ink that wasnt watered down and i just brushed it on and then wiped it off with my finger or a kleenex. if you are talking about the weird looking fungus then that is made of green stuff that i poked holes in with a toothpick. very easy and it looks pretty good i think. thanks for the comment!