Because of the difficulty in distributing glow images with the interiors, I never released these images into the wild. Well, no longer! Glows are now done in-game and so here are the images I made. Also, I will take any viable images from anyone else and in theory, we could have a massive repository of pre-made interior images for all room layouts.
First, the file: interior.zip
Next: The schema: In that file you'll find over 100 images with odd looking - at first - names. For example, room_weapons_2._c_w_s.png looks like this:

Each file is named so you could figure out what it contains. I'll break it down:
room_type_dimensions_layout.png
type: weapons. drones. whatever.
dimensions: 1 means a vertical 1x2 room (1 is a vertical line after all). 2 is a horizontal 2x1 room. 4 is a 2x2 room.
layout: The meat of the name. Starting on the left side of the upper wall and moving around the room clockwise, this string describes what's on each wall square like so:
- _ = The wall is bare. A door could go here and I suggest only having doors on these walls.
- c = Computer. Only one per room. It will always face that wall.
- w = Wall art. Technically unique per room type but a bit generic.
- s = System specific wall art. Missiles in the weapon room. O2 tank in the O2 room.

Hopefully these will help someone else, and hopefully people could submit extra images as they make them. I'll update the zip whenever is necessary and may even get around to having some sort of indexing system to download them, though my time is limited.
I'm open to constructive critiques and am totally willing to change anything about the naming scheme. At this time it'd be easy. If we end up with thousands of images it'll be much harder to change at that time.