I suggest adding a new decorative stone for Twilight Forest (like diorite/granite from Overworld) - malachite

From left to right: malachite, malachite brick, smooth malachite, and malachite pillar.

Link to download .rar with textures - link

Those are some pretty and snazzy textures! Unfortunately, we're not looking to add any stone variants to the world. We actually turned down the rate at which the three vanilla stone variants generate at some point.