Plans for Passive Solar Homes
This is a really nicely done tiny home (204 sf). Carrie and Shane are the owners, designers, builders and the people who live in it. They provide a lot of detail on how the design came about and why it has the layout and features it has. And, what its been like to live in for a year. The house pictures sections provides a lot of detail on the design, and the video on the same page goes through a lot of the design features and rationale -- very nicely done. There is also a blog. The house is, of course, very energy efficient not only because its small, but because its well insulated and sealed.
Related: Plans and Blue Prints