Redstone will be floor lights, as seen in various Empire interiors, and a bit in the Falcon. The new textures have "overlay" images for Redstone Dust, so it's not always red now.
I'll probably use this technique for making lights along the docking bay bulkheads in the Death Star:
The stone slab is pulling double-duty. If you use it as a wall material, it's white, but if you use it on the floor or ceiling, it's a grate. It's the only slab that uses a separate texture for the top. It will be used for grating in the Falcon, Star Destroyers, and Cloud City carbon chamber. Here it is inside the Falcon:
Here's the Falcon ramp, using it as a ceiling grate:
small update. after looking through various settings, it seems there's a use for "long vertical lights" and "long horizontal lights"
Here is the docking bay using vertical lights on the ... what are those, buttresses?
Using quartz now instead of birch. Birch might end up being another type of sandstone. I think it's important that the textures match the originals as much as possible. It allows for easier crafting, and if you make something using the textures, it's not going to look like a clown show with the textures off.
I finally got connected textures to work again. It's usually used for windows and glass. But I'll also give the interiors some variety by making connected textures for the Death Star/Star Destroyer, and Tantive/Cloud City/Hoth.