This may be more architecture than interior decor, but a friend recently re-posted this 2014 article about a historic school house redo in Nova Scotia that I thought might interest you. Some points of interest are how the minimalism of modern architecture kind of works with the spareness of functional old architecture. And I liked the idea of the "service core" (storage unit) in the middle of the building.

Isn't the mustard yellow they chose as the dominant accent colour just so school house, for better or for worse.

To me this building kind of exemplifies East Coast modern architecture which tends to have gable roofs and to be kind of spare in execution while relying a lot on local craftspeople.

http://eastcoastliving.ca/2014/10/modern-schoolhouse-2/