Between now and the 25th you can get items when you log in. One for everyone and one for members.
Currently you can get two of the items, but here are the ones from December 21st – December 25th! All member items are furniture.
On December 21st nonmembers can get the Hot Chocolate. (hand item) Members can get the Holly Jolly Couch.
This is the Hot Chocolate:
This is the Holly Jolly Couch:
On December 22nd nonmembers can get the Frost Bite Cavern Background. Members can get the Festive Light.
Frost Bite Cavern Background:
On December 23rd nonmembers can get the Race Car Controller, a hand item. Members can get the Make and Bake Kitchen.
The Race Car Controller:
The Make and Bake Kitchen:
On December 24th nonmembers can get the Green Lightbulb, a head item. Members can get the Santa Desk furniture piece.
On December 25th nonmembers can get the Arctic White colour. Members can get the Frost Bite Palace Igloo.
The Arctic White colour:
Here is the Frost Bite Palace Igloo, as shown on the “you need to be a member” popup.