This is how I decorated the mantel for winter after I took down the Christmas decor.
I laid icy branches over white LED mini-lights, added snowflakes and two pillar candle holders on each side. I am always a fan of using Battenburg lace as part of my winter decorations. It has a "snowy" look to me. (I'm not sure why the lights look blue in the pic but IRL they are a very white colour)
Real pine cones were sprayed with faux-snow from a can.
Be sure to head over to The Stories from A to Z and check out all the other fabulous ideas for decorating your mantel.