It's probably red in the parallel universe on Fringe.
It reminds me of the alternate ending I'd dreamed up for "Doomsday" way back when: After the Doctor says goodbye to Rose on the beach, she suddenly hears a familiar wooshing sound. She turns around and sees a red police box. Christopher Eccleston walks out, dressed in a Tom Baker-ish wardrobe, looking with a bewildered expression at a large fold-out map. He introduces himself to Rose as "the Professor" and asks her if she knows how to get to the Eye of Orion.