Gray blocks in Minecraft

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

Gray Wool
Gray Stained Glass
Gray Hardened Clay
Gray Stained Glass Pane
Gray Carpet
Gray Shulker Box
Gray Glazed Terracotta
Gray Concrete
Gray Concrete Powder
Gray Bed

Blocks by Color

Blocks by Material

Blocks by Version