This is a mod my friend made as a part of ModKingsCo.

--DrinModder's Mossy Cobblestone mod--

this mod makes mossy cobblestone spread to regular cobblestone. moss will spread to adjacent cobblestone as long as the light level is not very high. using bone meal on mossy cobblestone will make it spread instantly to all surrounding cobblestone blocks. using a hoe on mossy cobblestone will make it revert back to regular
cobblestone, and moss will pop off. this moss can be used directly on dirt or cobble to make grass or mossy cobble. it can also be crafted into grass, mossy cobblestone, and slimeballs.

recipes:

grass:

e e e
e m e
e d e

e=empty,m = moss, d = dirt

mossy cobblestone: put cobblestone and moss in a grid, the placement doesn't matter

slimeball:

mm
mm

m=moss

this mod must be installed by dropping the classes into the jar. NO MOD FOLDER INSTALL.