Here is some research on material. I will make it short, those are the characteristics of the material that I like.
FABRIC : flexible, durable & strong
STEEL : flexible, strong, durable, elegant & glossy...
PAPER : bright, elegant & flexible.
CLAY : rough, simple, dim colours, flexible & elastic...
Ceramic : glossy, luxury, durable, super bright...
RUBBER : flexible, elastic, durable, soft & kind of strong ....
WATER : flexible in forms, transparent, twinkle under light...
COAL : dark, hard, rough, dusty...