Apply effects to your textures for multiple tasks. Apply any effects to your color buffer and make the rendering result more unique. Or directly filter the textures of your scene right after importing them. 

Render your 3D model into a texture. Select between rendering modes and pick the best looking for you. You can switch rendering modes in run-time as much as you want. And you can render the PBR result into a texture too.

Mix 2 different textures using different mixing techniques.

Create a canvas and paint it! All you need to do is set brush properties, determine a color value, provide 2 different two dimensional points and that's it. Now you have a beautiful stroke in a texture. By using this mechanism you can create a painting feature in your games or applications!