A Blender material mini pack (Blender 4.0 or later) that includes 5 procedural materials. Available for download (personal and commercial). Attribution is not required but it is appreciated.
Included:
Wood
Metal
Concrete
Sheer Fabric
Bronze
Pumpkin
Stem
Hologram
Sand
Ceramic
Leather
Lava
Stucco
Camo
Grunge
Tree Bark
Brick
Paper
Tile
Rusted Metal
Dirt & Water
Rock
Matte Plastic
Glossy Plastic
Translucent Plastic
Jade
Wavy Glass
Clear Glass
Frosted Glass
Asphalt
Eye
Wax
Stripped Fabric
Cliff Face
Anime Shader