Well, it is now purple ship's corridor. KOS-MOS doesn't care about colors.

"There are adequate medical personnel aboard this ship without your presence. Additionally, you are not currently engaged in medical training. Recreational use of this facility is low priority."

Oh, look, now there are monsters (http://www.youtube.com/watch?v=Y6QoUu6Y-oM&feature=related) gallivanting about in the simulation.