Today is a super double Yuletide holiday as it is both the last Advent and Winter Solstice. Today the last purple candle should be lit. The last candle is the shepherd candle.
Luke 2: 8-15
And there were in the same country shepherds abiding in the field, keeping watch over their flock by night. And, lo, the angel of the Lord came upon them, and the glory of the Lord shone round about them: and they were sore afraid. And the angel said unto them, Fear not: for, behold, I bring you good tidings of great joy, which shall be to all people. For unto you is born this day in the city of David a Saviour, which is Christ the Lord. And this shall be a sign unto you; Ye shall find the babe wrapped in swaddling clothes, lying in a manger. And suddenly there was with the angel a multitude of the heavenly host praising God, and saying, Glory to God in the highest, and on earth peace, good will toward men. And it came to pass, as the angels were gone away from them into heaven, the shepherds said one to another, Let us now go even unto Bethlehem, and see this thing which is come to pass, which the Lord hath made known unto us.
Sing While Shepherd Watched Their Flocks by Night
The shortest day of the year was an important holiday for many pagans and pagans are fun. Solstice is the day for drinking wassail. It is also customary to give a portion of the wassail to any fruit trees or other plants that you would like to thrive in the coming year. Pour it on the ground and the base of the plant. This makes them magically fertile. The focus of the day should be the darkness and awareness that more light and warmth are on the way. To remind myself of this I did not use electric lights, but relied on puny candle light. It's nerdy, but it was kind of fun and old-fashiony.