"Harry arrived early in the Room of Requirement for the last D.A. meeting before the holidays and was very glad he had, because when the lamps burst into light he saw that Dobby had taken it upon himself to decorate the place for Christmas. He could tell the elf had done it, because nobody else would have strung a hundred bolden baubles from the ceiling, each showing a picture of Harry's face and bearing the legend HAVE A VERY HARRY CHRISTMAS!" - Harry Potter and the Order of the Phoenix
Every year at Christmastime, we give our tree a theme. Sometimes it's a color, others a T.V. show - this year it was Harry Potter. We were getting ready for the trip to The Wizarding World of Harry Potter over the summer. We filled our tree with the house colors and other various wizard paraphernalia.