I always plant snapdragons, the tall ones. Also I have kept some foxglove I grew from seed alive. They bloomed last spring and even reseeded so I have them too. Also do viola and sometimes dianthus. Thay all just kind of languish through the winter but really take off in early spring. I'm trying some poppy seeds again but don't usually have much luck.
As for the winter vegetable garden we now have mustard, turnip, rutabaga, swiss chard, lettuce, broccoli, cauliflower and carrots. I might be forgetting something. I love greens. So there is always something growing here.