Place a Christmas Tree on your desktop, with X-mas Tree
X-mas Tree is a free and very well-designed Christmas Tree you can place on your desktop.
When you open it you watch it coming to life as it decorates and lights itself up. Its candles are animated with discreet flames.
You can move it wherever you want on the screen and adjust it to remain on top of other windows, or in the background.
Contrary to similar decorations, this will not appear in the Alt-Tab sequence.