This is a paid asset, but now you can download Modular Environment Pack Stylised Free.
Detail this asset from Unity Store: Original Link
Modular Environment Pack Stylised v1.0
This is a modular pack can be snapped together to allow fast and efficient environments of any scale to be created quickly.
The custom shader included allows for multiple textures to be placed in the Red, Green, and Blue channels of a single texture map, saving masses of texture memory, based on the texturing methods of Sunset Overdrive. Also, it uses world space grunge to break tiling textures and add a ‘Toon’ like feel to it!
As you can get more color variations out of the shader, it means fewer materials and more savings on draw calls through Unity’s static batching.
Here’s how I made it on my blog
Thanks!