Stacked bricks! This mod supports bricks from the Minetest Game, Technic, Moreblocks, and Ethereal NG. Mods may register their own using stackbricks.register_stackbrick.
Stacked bricks are crafted by putting a brick onto another brick in the crafting grid, or by putting their slabs like so. Slabs registered in Minetest Game and Stairsplus (bundled with Moreblocks) are supported.