These are some of the materials i created in octane (c4d) as a practice about 15 material you can download the pack from down below, I have also added materials like dirt and rust which you can use them to create different materials by mixing them .

S p e c i a l   t h a n k s   t o
Quixel team for their amazing shader ball that i used 
Grant Warwick for his shader ball which is included in the c4d scene 
i have also included the corona shader ball from 
i also included a modified quixel shader ball with octane logo on it if you want to use it 
also big thanks to for the awesome dog scan that i used as a testing object for their textures for their HDRI

Have Fun learning and creating materials .
Painted Metal with blood stains
chameleon paint 
Rusted Metal
Tank material
Simple Gold
Worn Painted metal
Coal Dirty Wood 
Normal Wood
Rough wood
Red Wood
Mossy Rock Surface
this is a test using the scanned Object i mixed the dirt material with the rusted metal which they are both included and this is the result , you can play around with them or dissect them to learn new things especially for beginners have fun .
This is the perfect layout that i used to create these materials, you can replicate it in c4d 
PS: if octane crashes on you when you try to render your own geometry remove the included softbox lights group and save and re render and everything should be fine