Zyraphim
The Destroyer
This tool sold by the Dryad will turn any block into an "accented" version of itself that acts like Stone Accent Slabs
Breaking these accented blocks will drop their normal counterparts
This suggestion is based on my completely unfounded idea of how the blending / accenting system works, and I'm utterly clueless about how Terraria's engine actually functions, so I'm not sure if this is actually any easier than just making an accented version of every block in the game