I didn't see this mentioned here, but as it made even the Community News on the official site and all, I thought it nice to spread the joy even more. Guild Wars Wintersday Calendar is a collaboration project by fan artists from (and outside!) the GW community, organized by Perynne/Shinanai. It's like a traditional Christmas calendar, except that it's in digital form and the theme is, of course, Guild Wars.
(haha and this is my first 'real' post here tho I've read the community for several months and commented once or twice -- nice to meet you all)