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I also saw the connection of RGB and the digital world, but I think it went a lot further than that as well. RGB did provide the basis, but it seems like Hershman-Leeson wanted to take those colors further, and perhaps convey the fact that they "color" or lives and our personalities (similar to the previous post on women's personalities).

We see that Marinne is blue and her character is preoccupied with entering into the "human" world, leading to her depression at certain points when she feels trapped. Similarly, Ruby symbolizes lust and the passion, and it's interesting that her character is the one that adapts the best--she is able to enter into the human world and eventually find her soul mate. It is almost as if (as mentioned in other posts) the fact that passion is many times seen as a human quality, one that lacks premeditation and is acted upon suddenly, that she can be the most human--she has the innate ability to make her own decisions an act rashly at times (when she decides to save Olive and Marinne). Olive is more difficult to understand. Her green color seems to evoke an idea of infancy and "nature" she has not as many desires as Ruby or Marinne and seemingly follows along with what either Ruby or Marinne want. Suggestions for a better interpretation for Olive... ? I'm grasping at straws for this one.

As far as the walls being blue/green, it seems to also convey the fact that they feel trapped within their rooms (blue) and that they seem to regress to child-like states when in these rooms (green), dancing around to please their creator Rosetta and often sleeping or waiting for the next time she contacts them.