Hammerhead is correct. I am flattered by (and, let's face it, encourage) Piratecat's belief that every detail of my game is a lovingly handcrafted puzzle-piece that fits seamlessly into an incredibly complex puzzle. But while I do my share of foreshadowing and long-term planning, I'm also like a runaway puzzle-piece factory that continuously churns out pieces, some of which can be later made to appear to fit together as if by pre-planned design.
In this case, the changing colors of the door into Het Branoi had nothing to do with any specific Eye of Moirel, and instead, as Hammerhead notes, reflected the strongest colors of the Slice on the other side. (Peek behind the curtain: had they gone in when it was red, they would have found themselves in a Mars-like Slice, albeit with more oxygen. Had they gone in while it was blue, they would have landed on a tiny deserted island in the middle of an ocean.) In hindsight, reading the speculation on this thread, I missed a cool foreshadowing opportunity there.
At this point in the story, the Company has been assuming that the Eye in Het Branoi was blue, since that's the color of all the Ways once you get inside.
-Sagiro