Try a "moving meeting." Every cubicle-dwelling office worker yearns for a few minutes outside on a beautiful day, even when it's cold. Hold your next meeting while walking on a trail near your office. Just be sure someone brings a sturdy notepad--not an iPhone--for taking notes.
Ditch the treadmill. Load up on some cold-weather running gear and hit the trails for an afternoon jog, even when it's cold. Not only will you boost your creativity, but you'll also get a dose of mood-boosting endorphins that can help ward off seasonal affective disorder (SAD). Feeling adventurous? Here are some ways to Exercise in a Blizzard.
Find a winter sport you love. Snowshoeing and cross-country skiing are great ways to appreciate nature, since you can't do them anywhere but far, far away from urban areas. No snow? Just adapt your favorite summer sports to cold-weather days (and pile on a few more layers)!