It is great to have a sustainable construction house. If you want to feel it, you can just take countryside style for your house. The most interesting part is on the living room which is designed with countryside view.
To give the sense of mid-century modern design you can also combine it with rustic décor. For example, you can buy 50s desk model and you can put it under the stair. You can also add red floor lamp, red dining chair, and glossy black kitchen cabinet. The mixing style looks perfect for a sustainable construction house. In short, it is very creative style to be applied to your house.