Just had a look and found some Christmas images.

There is also a group background which can be found here.

Update: It seems Habbo have uploaded (and reuploaded) some new SWF for the advent, there are more but I am still collecting them all and trying to figure out the order.

SWF 1 SWF 2 SWF 3 SWF 4 SWF 5 SWF 6 SWF 7 SWF 8 SWF 9

It seems Habbo are now uploading with random text to make our job easier and the way we put them in order before has been blocked from us (bad Sulake).