This is a procedural moss shader created in Blender that works with Cycles and Eevee. It's just as simple as dropping the shader between your principled BSDF and material output and you have a beautiful customizable moss shader ready to render!

All the shaders are 4k

If you want this shader to be in all your other projects, you need to save the project as a startup file. to do this you need to go to:

File_Defaults_Save Startup File