The two types of sandstone walls
The iron gate, shown in a red brick wall.
Walls in the four textures of stonebrick
Netherrack and Quartz walls. Though the quartz wall uses the chiseled texture, it takes ordinary quartz blocks in its recipe.
Yes, torches attach to these new walls.
Though the new walls "reach out" toward vanilla walls (normal and mossy cobble), the cobble doesn't reach back. This leaves a small gap, which might be good or bad depending on where you put it.