Customizable Corrosive Cubes?
I think it would be cool if builders could customize the colors of the corrosive cubes, so that they could be tailored to the aesthetics of a base.
Like for the yellow blocks (can't remember the pack name rn), a green corrosive cube could make it look like your base is filled with toxic ooze, or a light blue corrosive cube could make it look like it was crackling with electricity.
For the slaughterhouse or industrial ruins, a red corrosive cube could make the place look even more bloody.
For the medieval packs, you could use a dark blue to make it look as if your castle had a moat.
If you could make corrosive cubes yellow, you could combine that with the white bricks and golden age blocks for a holy look.
So yeah, I think being able to customize the color of the corrosive cubes would do a lot for artistic expression in building.