Here's what I have so far:
DS 13 has a 6 ft. tree in his room decorated with all red lights and silver balls. Looks really cool, as his room is all red, black, and gray/chrome.
DD 17 has a 6 ft. tree in her room with multi-colored lights and sentimental ornaments, mostly from our travel and some special ones from early childhood. Her BF also added a few of his own to the tree.
In the living room I have evergreen (fake) garlands swagged over the windows with red bows at the corners, a lighted garland and wreath above the fireplace, and our main tree, which is done this year in a peppermint theme. I used all red and white lights (tons of them!), red balls tied with white bows, two sizes of candy canes, red bows, red striped bows, and a garland of starlight mints that I spent two weeks stringing together!
I've got to say, it is the best tree I've ever done! I just love it.
I have my very large snowman collection displayed on the bookshelves and a small fiber optic tree in the kitchen/dining area, along with red placemats and snowman tableware.
Outside: Mini white lights on the house, large "candy canes" and white lights along the sidewalk, artificial poinsetias and more of the large candy canes in the flower box that runs along the front of the house, and last but not least, a snow family that I painted and cut out of plywood is spotlighted in the center of the yard!
Still to do: Christmas village will go up today. It will take up space on top of the piano and on top of the entertainment center. I will also do our main bathroom all in red and green with red plaid accents. It's an easy switch, since it is already done in red, all I have to do is switch around a few accesories, hang a wreath, and set the 2 ft. tree on the counter.
I'd better get busy!