20 floor and wall design ideas for Minecraft
Fill the room with Spruce Planks and make every third row Dark Oak Planks.

These planks are sawn from the dark spruce of taigas. Planks are the basic wooden building block: one log gives four, and they go into crafting tables, chests, tools and countless other recipes. All planks work alike; the Oak Planks page explains their uses.
It is made with the Crafting Table from Spruce Log (or another variant). It is mined with an axe. As fuel it burns for 15 seconds in a Furnace, enough to smelt 1.5 items.
Any of #spruce_logs → 4 × Spruce Planks
// Slots with several items cycle through every accepted option.
Fill the room with Spruce Planks and make every third row Dark Oak Planks.
At the Crafting Table: 1 × Spruce Log (or another variant) gives 4 × Spruce Planks. Mining the block drops it.
They are the basic wooden material for crafting tables, chests, tools, sticks and building. It is an ingredient in 50 recipes, made at the Crafting Table; for example Blue Bed, Bookshelf, Bowl, Brown Bed, Cartography Table and 42 more.
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, Spruce Planks gives the Double bass sound.
Yes: fire can spread to it and destroy it, and lava nearby can set it alight.