Silver (Light Gray) blocks in Minecraft

What's the best thing to use for silver (light gray) blocks? He's a list of silver (light gray) colored blocks that could be used in decoration.

Light Gray Wool
Iron Block
Light Gray Stained Glass
Light Gray Hardened Clay
Light Gray Stained Glass Pane
Light Gray Carpet
Light Gray Shulker Box
Light Gray Glazed Terracotta
Light Gray Concrete
Light Gray Concrete Powder
Silver (Light Gray) Bed