20 floor and wall design ideas for Minecraft
Cobbled Deepslate at the bottom, Deepslate Bricks in the middle, Deepslate Tiles at the top.

Deepslate Bricks come from four polished deepslate, or from a stonecutter; ancient cities use them in their walls. These bricks are part of the Deepslate building family, with their own slabs, stairs and walls. The Deepslate page describes the material.
It is made with the Crafting Table from 4 × Polished Deepslate (other recipes also exist). It is mined with a pickaxe.
4 × Polished Deepslate → 4 × Deepslate Bricks
Deepslate → Deepslate Bricks
Polished Deepslate → Deepslate Bricks
// Slots with several items cycle through every accepted option.
Cobbled Deepslate at the bottom, Deepslate Bricks in the middle, Deepslate Tiles at the top.
At the Crafting Table: 4 × Polished Deepslate give 4 × Deepslate Bricks. At the Stonecutter: 1 × Cobbled Deepslate gives 1 × Deepslate Bricks. Mining the block drops it.
It is a dark building block of the deepslate family. It is an ingredient in 8 recipes, made at the Stonecutter, Crafting Table and Furnace; for example Deepslate Brick Wall, Deepslate Tile Slab, Deepslate Tile Stairs, Deepslate Tile Wall and Deepslate Tiles.
The fastest tool is the pickaxe.
Placed under a Note Block, Deepslate Bricks gives the Bass drum sound.