I think Japanese schools are something to learn from. They usually have openable windows to let fresh air in, the "commons" area is usually outdoor and students cleanup and care for the school itself -- which teaches students to be responsible and it makes them feel like they are an essential part of the school, not brains to be herded. I don't care much for the uniforms though.
Now I am curious how schools in scandanavia are, given their famous prisons.