There are Webkinz Christmas Tree ornaments available in stores. When you purchase a real ornament, it comes with a code you enter online. When you enter the first code, you you get the Decoratable Christmas Tree. With each ornament you enter, you get a virtual copy of that ornament, plus 2 extra virtual items (see below). These extra items will either be ornaments, garlands, toppers or bases.

You can change the look of your tree as much as you like with the different ornaments, garland, topper, or bases. You only need one to start decorating but all 24 in order to unlock the fireplace.