Tree Roots on Muddy Ground
Tree roots stretching across muddy ground with rocks
 
Forest Ground Texture with Twigs, Pebbles and Rocks
It is a ground in a forest covered by big rocks, different sizes of twigs, pebbles and stones.

Those twigs and pebbles are different in both sizes and colors. They are randomly scattered among the whole ground.

Dirt can also be found around branches and stones.