Check out a Unity pack that includes 160 procedural materials.
The materials come in low resolution, put in high resolution following the steps described in the text document “READ ME FIRST”. Please look at the preview of the package before making the purchase, you will be able to see all the materials in this way.
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This package will receive updates with new materials every month! Extremely lightweight: weighing only a few kb (with no quality loss). The materials are in Substance format (compatible with all Unity versions). You can set the resolution of your choice! Comes with special materials with customizable parameters.
VCDESIGN
You can find more details on the pack here.