Here is an interesting inflatable environment. While intended mostly for art, I can imagine this as shelters rapidly nanoprinted and later made permanent on Mars and asteroids. http://io9.com/5827141/architects-of-airs-inflatable-luminaria-will-blow... http://www.architects-of-air.com/ As Bigelow Aerospace demonstrates, inflatable habitats might be quite feasible. http://en.wikipedia.org/wiki/Bigelow_Aerospace http://nextbigfuture.com/2011/01/bigelow-aerospace-inflatable-expansion....