Loving the Fall, by MissAnnThropic. Summary: The Winchesters adjust to life as civilians while Castiel adjusts to being human. Christmas-fic. AU. Dean/Cas, Sam/OFC.
This is a sequel for her fiction Leap That Makes the Fall that really should be read first.
http://miss-annthropic.livejournal.com/75026.html (http://miss-annthropic.livejournal.com/75026.html)

Among Your Friends and Kindred, by ratherastory. Summary: It's Christmas day, and nothing bad happens at all. No, really. AU. Gen.
Part 30 of the Fusion verse series.
http://archiveofourown.org/works/378400 (http://archiveofourown.org/works/378400)

Thanks I'll check them out :)

It's not strictly a Christmas fic, but the Cold Academic Hell 'verse (http://moorishflower.livejournal.com/179572.html) has a couple of chapters about Christmas. AU with Dean/Cas, Sam/Gabriel.

Again, not strictly a Christmas fic, but the Ugly Sweater !Verse (http://archiveofourown.org/series/24368) was kicked off with a Christmas fic. (She's added a prequel since, so the Christmas fic is Part 2.)

Thanks. I'll have a look. :)

Okay, I don't even *like* Christmas, and this choked me up:

And Death's Dark Shadows Put to Flight (http://ratherastory.livejournal.com/102813.html) by ratherastory.

<3

Thanks, I'll have a look now :)

http://archiveofourown.org/works/579566/chapters/1040079

At Christmas, All Roads Lead Home ..... by Apentomyheadandimdead
[The apocalypse is averted, Sam is in the pit, Castiel is human, and Dean struggles to exist with the aid of Bobby and Castiel. All just in time for Christmas.

A series of related holiday-themed fics. [25 Days of Christmas, posted every day]]

Still being updated, and a bit behind, but fluffy and promising!

Thanks :)