20 floor and wall design ideas for Minecraft
Put upright Stripped Spruce Log posts every 4 blocks and lay logs flat between them at floor and ceiling height.

Peeled bare, its wood is the dark spruce of taigas. Stripped logs are logs whose bark an axe has peeled off. All stripped logs work alike; the Stripped Oak Log page explains them.
It is mined with an axe. As fuel it burns for 15 seconds in a Furnace, enough to smelt 1.5 items.
This item has no crafting recipe.
Put upright Stripped Spruce Log posts every 4 blocks and lay logs flat between them at floor and ceiling height.
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Mining the block drops it.
It is a log without bark, used for building and for hanging signs. It is an ingredient in 8 recipes, made at the Crafting Table and Furnace; for example Soul Campfire, Spruce Hanging Sign, Spruce Planks, Spruce Shelf and Stripped Spruce Wood.
The fastest tool is the axe.
Yes. In a Furnace it burns for 15 seconds, enough to smelt 1.5 items.
Placed under a Note Block, Stripped Spruce Log gives the Double bass sound.
Yes: fire can spread to it and destroy it, and lava nearby can set it alight.