Anyone remember those stone bricks? Well, how about we bring those back, but! add in a construction use for them - stone bricks would be required mainly for stone walls. Unrefined stone could be used to make a cobblestone floor. Roofs could go either way - through either unrefined stone or stone bricks, and some floors (like the checkered and/or colored ones) would use stone bricks as well.
One problem I usually find myself with is the need to level up the mason to craft the blacksmith’s hammer and spoon (and sometimes the knife) really quickly, but having to waste resources to build decorations, which I usually just end up selling. The addition of stone bricks could fix this problem and add in a little more depth and flavor to building, in that usually stone structures are a sign of an advanced, or atleast refined, civilization. In those terms, you would need a mason for the construction of stone buildings, instead of being able to create them right off the bat.