design suggestion? what recipe? can zombies break it, if so on what difficulty? apart from looks does it have any other use? can you manually open it like a wood door, or does it need redstone like an iron door?
I would assume that the glass door recipe would be the same as other door recipe, and would just be a plain glass door. However, would zombies break the door? How would it open? Would it drop itself when broken? Those questions need answering.
But still, I've wanted glass doors in Minecraft for years.