I had another sugggestion there, introducing 3 more clastic stones into BH.
-looks like pebbles bound with brown/yellow/white hardened clay, mined conglomerate is polished as marble.
-1.5x stronger than regular stone.
-spawns in dirtless mountains.
-used for making stairs and columns.
-Beige basalt, stays the same when mined.
-Strong as normal stone.
-Spawns in frozen biomes.
-also used for stairs and columns.
-light brown, smooth when not broken
-spawns at 475 blocks above Magma.
-Powerful (as limestone, however).
-Used for stairs, columns and, when powdered (the powder is created from this material, for 5), as a dirt alt in the creation of clay.
Sandstone will also have the standard sand colour.