Here are the Club Penguin Clothing Catalog Cheats for December, 2008.
Click on the Christmas Tree lights (each one) to get the yellow scarf.
Click on the top of the snow-covered tree to get the Russian Hat.
Click on the beak of the penguin holding the snow balls to get the red viking helmet. Do this a bunch of times in a row to get the blue viking helmet.
Click on the lighthouse in the background to get the red hoodie.
Click on the pink flipper to get the black superhero mask.