The first gift that I am thinking about that is exemplified and symbolized in the season of Christmas is the ultimate gift of God.
It is the gift of Himself.
God put on flesh and came to us in a time when we could not find Him.
People knew about God, before Christ came, but people could not be in closest communion with Him, until Christ came to redeem the lost.
If we celebrate Christmas through all eternity, it could never show the beauty or the splendor of the magnitude of how great a distance the Lord of Glory came to become man and be born in the greatest humility.
He kept saying throughout His life on the earth that the sorriest people are the people who think that there is no need to be reconciled to God. Those who know the most about God without redemption in Christ cannot know communion with Christ. It is very clear throughout the Old Testament, that the "Children of Israel" were given private access (so to speak) to knowledge about God to point them to the need of a Savior. It was clearly impossible
that the blood of bulls and goats could atonefor sin and give access to the eternally perfect God. God wrapped the perfect present in the skin of humanity and gave us Himself. Halleluia, What a Savior.