I had a Christmas/winter wedding 10 years ago. It was rather unconventional, so I'm not sure if you can get any ideas from it, but here goes.
I wanted a Christmas-time wedding, and I wanted it to be FUN. I wanted to have a Christmas party atmosphere, and I wanted to make sure that the kids attending wouldn't get bored.
Not far from where I live there are several orchards where you can go pick fruits, etc. One of the orchards has a christmas tree farm where you can cut your own tree. They also offer sleigh rides that culminate with cocoa, cookies and christmas carols by a big bonfire. On site is a huge barn that they allow you to rent for parties.
This was exactly what I was looking for.
Our guests were informed ahead of time that part of the festivities would be outdoors, etc, and of what activities would be available to them.
The barn was decorated with several christmas trees, and large baskets of pointsettias. There were tiny white lights on the christmas trees, and on the evergreen garland that was strung along the railings. The wedding was at night, so the christmas tree lights REALLY looked gorgeous in the barn and smelled WONDERFUL.
The parking lot was a bit of a walk to the barn...and it was snowing...so the guests were brought to the barn by the horse-driven sleighs. The horses wore wreaths around their necks made of fresh evergreens and holly, and the sleighs were festooned with evergreen boughs and sleigh bells. It was not only a beautiful sight, but a beautiful sound as well.
I wore a fairly simple ivory velvet dress. Over the top, I had a matching velvet floor length cape that was trimmed in fur along the bottom edge, and around the hood. I did not carry flowers, I had a muff instead.
My maid of honor wore the same attire, but in a burgundy color, and the 2 bridesmaids wore hunter green.
After the ceremony was over, the fun began. The chairs were re-arranged and tables were brought in. The centerpieces on the tables were large glass bowls filled with beautiful christmas ornaments and tiny white fairy lights.
We had a buffet-style dinner with turkey, ham, roast beef, and all the side dishes that you could imagine.
Instead of a cake, we had a dessert buffet...you name the dessert, and it was probably there.
Along with the usual drinks offered, we had spiced apple cider, cocoa, hot-buttered rum, and hot spiced wine.
In one area of the barn, there were tables set up with pre-made gingerbread men and gingerbread houses. The kids as well as several adults had a blast decorating their cookies and houses to take home with them.
There was also a table set up with plates that had the saying "Cookies For Santa" outlined on them. Again, the kids as well as some adults loved using the markers and paints to decorate their plates.
Outside, the bonfire was blazing, and there was always a group of folks there, singing christmas carols and roasting marshmallows. Several of the guests built snowmen, and I recall a snowball fight or two as well.
We had pre-arranged for our guests to be able to get a fresh-cut tree from the farm. Anyone that wanted to could get in one of the sleighs and be taken to the christmas trees to select one to take home. The little kids LOVED going out to pick out the family tree and watch it be cut down.
We had a BLAST. Our guests went home with christmas trees, gingerbread cookies, gingerbread houses, santa plates, the ornaments from the centerpieces, full bellies, rosy red cheeks, and a lot of christmas spirit.
Whatever you do, I'm sure your wedding will be beautiful...winter weddings always are. My only advice to you is to have FUN.