Prometheus begins with a pre-dawn blue light. This scene feels as calm as morning coffee before the hustle and bustle of a world springing to life. The morning look works as a sort of double entendre of figurative foreshadowing: present day in lush Scotland finding cave paintings like the scene before, as well as linking that past with the monochromatic alien world to come.
Other colors in this film are almost exclusively reserved for humans and human habitat. The sterility of monochromatism isolates the cerebral logic and monolithic power of the alien world from the nature and emotion of humanity.