Rock: Ridgid and tough
Wood: Natural, eventual decay
Glass: Fragile and transparent/colorful
Paper: Lightweight and flexible, yet tears easily

Copper: Less expensive, down-to-earth
Silver: Shiny, allergic to my skin
Gold: Self absorbed, obsessed
Platinum: Tending to try for perfections or egotistic, ADHD or OCD

Air: Invisible and wayward, nomadic
Water: Flowing and graceful
Fire: Warmth and passion
Earth: Round and supple