Three somewhat random selections from me too. One, I've always the loved originality and aplomb of @Mikiesboy's Christmas entry to the Secret Santa contest.The Letter: A Christmas Tale is a wonderful romance.
@Puppilull's contribution to the same contest was a stunner. It's a romance with a twist, and a hint of desert sand. Please read Habibi if you haven't already.
And thirdly, @Cole Matthewswrote one that sticks with me because it's so beautifully tender. From Advent Calendar least year, be sure to check out Eternal Flame.
There are many more wonderful Christmas tales on GA, but I just limited myself to three. Happy reading!