I have made some improvements to the map editor and also made an export of all the available rooms in Dweller. If you are curious about what rooms you can come across in Dweller have a look here:
If you think a room could be improved in some way please click on it and it will load in the map editor. If you have ideas for new rooms you can head over to the map editor straight away using this link:
Once you are done editing or creating a new room click on Save in the menu and copy the direct link to the room layout and post it here or on the forum.
For additional information on how to create rooms have a look at this post.