I would really like to see an option to place down glass blocks similarly to minecraft. When designing a building, those could be used to create a greenhouse or huge windows! Light could pass through them. Maybe glass could get destroyed by enemies if they target it.
if weather and temperature becomes a thing, I could see this being even more usefull.
I also want glass windows. I have seen some in a few art pieces and such. I eagerly await using them in game.