Add an animated Christmas tree to your desktop complete with sparkling
garlands and twinkling lights, there's sixteen to choose from. It can
optionally stay on top and you can adjust transparency - a mouse-over hint
reveals how many days are left till Christmas. Drag-n-drop your tree to any
position on your desktop (but it won't stay where you put it if you have your
icons set to "Align to grid"). (in Desktop)