This was tough; I think a case could be made for any of the colors, but I was torn between blue and brown, because I think what both these colors symbolize epitomize Freffy, specifically season 4 Freffy. I decided to go with brown, because Freddie was stability and comfort for Effy. She could rely on him before she could anyone else, and they made each other so, so happy. And they endured so much together through both seasons, but especially season 4. Freddie took such care of Effy, and Effy was Freddie's first priority, just as he was hers.