Three space colony summer studies were conducted at NASA Ames in the 1970s. A number of artistic renderings of the concepts were made. These have been scanned and are available here as small, medium, large, and publication quality jpeg images. Scans by David Brandt-Erichsen.
Includes toroidal and cylindrical colonies and Bernal Spheres.


Full gallery:
https://settlement.arc.nasa.gov/70sArtHiRes/70sArt/art.html
