dumb question: where does one find christmas-y avatars?
It's real easy just look for a xmas image and make sure it looks ok at 100x100 then it'll work
(Carmageddon Max Pack)
A 100x100 image will loose some detail when scaled down to 49x49 (that's the size of the GOG avatars), not to mention 16x16 (that's the small size used for quoted posts).
And no, I'm not changing mine.