Not the most interesting subject, but I needed some good mud. Substance Designer ftw again!
Built in options for the shoe-prints, rocks, water height, and colors so it makes for a nice wide variety of muddy surfaces.
You can get the SBSAR on Gumroad here: https://gumroad.com/l/Borw
And see my whole set of Substances here: https://gumroad.com/_dc_