Mossy Rock Texture
It is a rock having a lot of moss and lichen on the surface. If you are going to create a natural environment, this material is fit for texturing large rocks, ground and cliff.
 
Birch Tree Bark Texture
It is a tree bark texture. From its horizontal patterns and the peeling, we can tell it is a birch tree.
Tree Bark Texture
It is a tree bark texture. The bark's texture is prominent. It has cracks and bumpy surface. Moss can be found on the bark too.
 
Wood Planks with Nails
They are wood planks with nails. By close examination, there are rust on some nails. The edges of the planks have worn. and a lot of dirt and dust rests on the wood.

Near grouts, mosses may also be found.
Moss Texture
This is a mossy ground that is full of green and yellowish moss covering the whole rock and ground.
Seashore Rock Texture Covered by Barnacles
This is a typical rocks that can be found near seashores. It is largely covered by barnacles and mosses.

Some barnacles are alive while some have became empty shells leaving a hole.

To texture a rocky seashore? This texture is absolutely a good choice.

To achieve a better result, I'd recommend to use it with the height map as well.
Rusty Metal Plate Texture with Round Cap Nails
It is a tremendously rusted metal plate. Thick layers of rust cover the whole iron surface, but the rust is thinner around round cap nails.

The rust has different colors including light brown, dark brown, orange and black.

Scratches can also be found on the rusty superficial.
Mossy Gray Brick Texture
Those gray bricks have a lot of mosses on the surface. If they are enlarged, lichens can also be found.

This texture is rather bumpy and coarse.

It can act as both a wall material and a floor material.
Wood Texture with Scratches and Mosses
This scratched wood is covered with countless mosses and mold/mould.

There are different colors of mosses. It implies it is a habitat of many species of mosses.

It is the optimal texture for antique furniture which is usually full of mold.
Fish Scale Roof Tile Texture
The classical fish scale roof tiles make up this weary rooftop texture. It is a worn-out rooftop with a lot of dirt, scratches and mosses.

The surface is rather bumpy and holey due to aging.