Quite a few people have independently commented on how the interior style I have chosen reminds them of pictures from the Space Shuttle or ISS. I quite like this association, so we have started to use it purposely. This image from the just finished aft bathroom is a good example:
The tubes are the starboard side freshwater fill and breather. They pass through the ballast tank before going into the bilge. The ballast tank top becomes a shelf for the bathroom.