Blender allows third-party asset libraries to integrate into Blender. We can download or purchase material libraries filled with custom textures that can be dragged right onto an object in Blender.
Here is my list of best material asset libraries for Blender 3D. See also my favorite Blender Add-Ons!
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Ryan King is a stellar Blender instructor. He regularly releases material packs and with Ultimate Procedural Materials, you get all of them… forever.
These are procedural materials with a lot of stylized options to spice up your renders!
Poliigon is the 3D material and asset library founded by Andrew Price (AKA The Blender Guru).
While Poliigon sells subscriptions to their massive library of materials, they also offer a lot of free PBR materials I’ve found incredibly useful and high quality.
With the Poliigon Add-On, we bring all the free assets right into Blender and (if you choose) can browse and purchase materials from within the add-on.
See this to learn about using and creating materials in Blender.