I found this site while looking at some designs for some out buildings I'm thinking about, i found this site. Some good stuff on here.

http://www.ag.ndsu.edu/extension-aben/buildingplans

I also ran across this bunker design.

http://www.ag.ndsu.edu/aben-plans/5950.pdf

And this for an animal shelter. I also saw the same design set up as an earth-bermed green house, with some mods done to it..

http://www.ag.ndsu.edu/aben-plans/b712.pdf