For me, that means less color but reflective surfaces, something that mimics the light from the sun coming off the snow. While I'm not a great fan of mirrors on the mantels, now might be the time to use one. And perhaps include something reminiscent of the bare tree branches.
And, of course, a lit fire. What brings warmth to the house like the glow of the fireplace on a cold winter's night. Maybe I can wait just a little longer for spring.