Dirt ground texture.
Converted brightness to opacity so the white areas are transparent so you can only see the changes in the black part of the texture when adding more effects. Not a repeated pattern.

It is under Monochromatic Pattern
You can add a clipped colored pattern/texture layer above it and also make a duplicate layer of this texture for more variety. It is also possible to add a clipped raster layer to color it (the black part can only be colored) too.
