Bricks in DecOre use a new resource, called Mortar Lumps, for crafting. This is based off of the process of building brick walls in the real world. To make Mortar Lumps, first you'll have to craft Unmixed Mortar using the following shapeless recipe.
Once you've made Unmixed Mortar, place it on the ground. Break the block to "mix" it, and it will drop 8-12 Mortar Lumps!
From here you can craft the lumps into bricks, or make a Mortar Block for storage or building purposes.
Comparison of Mortar and Clay blocks: