December 17:
Wisdom that comest out of the mouth of the Most High, that reachest from one end to another, and orderest all things mightily and sweetly, come to teach us the way of prudence!
Latin
O Sapientia, quæ ex ore Altissimi prodiisti, attingens a fine usque ad finem, fortiter suaviterque disponens omnia: veni ad docendum nos viam prudentiæ.
December 17, the Church begins the seven Great “O” Antiphons of the liturgy, that date back to the seventh or eighth century. These antiphons are chanted or recited at Vespers, or Evening Prayer, the Antiphon before the Magnificat. They are also the Alleluia verse at the Mass. Each antiphon begins with “O” and include a different Scriptural image through the Old Testament, all imploring the Messiah to come. As Elsa Chaney in Twelve Days of Christmas states, “They seem to sum up all our Advent longing as they paint in vivid terms the wretched condition of mankind and his need of a Savior.”
From Dom Gueranger’s Liturgical Year 
I love the connection food has in celebration in the liturgical year. It helps everyone remember what the antiphon focuses on and it helps us to focus on a different aspect of preparing to meet Jesus in His nativity. A wee bit of chocolate or some other sweet treat should suffice to honor this particular antiphon!
See Catholic Cuisine for celebration ideas!
More Antiphon information in delicious.
Here is a resource list to help you further your Advent Journey!
December 18:
Latin
O Adonai, et Dux domus Israel, qui Moysi in igne flammæ rubi apparuisti, et ei in Sina legem dedisti: veni ad redimendum nos in brachio extento
O sacred Lord of ancient Israel, who showed yourself to Moses in the burning bush, who gave him the holy law on Sinai mountain: come, stretch out your mighty hand to set us free.
December 19
Root of Jesse, which standest for an ensign of the people, at Whom the kings shall shut their mouths, Whom the Gentiles shall seek, come to deliver us, do not tarry.
O Radix Jesse, qui stas in signum populorum, super quem continebunt reges os suum, quem Gentes deprecabuntur: veni ad liberandum nos, jam noli tardare.
December 20
Latin
O Clavis David, et sceptrum domus Israel; qui aperis, et nemo claudit; claudis, et nemo aperit: veni, et educ vinctum de domo carceris, sedentem in tenebris, et umbra mortis.
O Key of David, and Sceptre of the house of Israel, that openeth and no man shutteth, and shutteth and no man openeth, come to liberate the prisoner from the prison, and them that sit in darkness, and in the shadow of death.
Come, and deliver him from the chains of prison who sits in darkness and in the shadow of death (Ps 107: 10).
December 21
O Oriens: “O Radiant Dawn, splendor of eternal light, sun of justice: come, shine on those who dwell in darkness and the shadow of death.” Isaiah had prophesied, “The people who walked in darkness have seen a great light; upon those who dwelt in the land of gloom a light has shown.” (9:1).
O Rising Dawn (O Oriens): O Rising Dawn, Radiance of the Light eternal and Sun of Justice; Come, enlighten those who sit in darkness and the shadow of death.
December 22
O Rex Gentium: “O King of all the nations, the only joy of every human heart; O Keystone of the mighty arch of man, come and save the creature you fashioned from the dust.” Isaiah had prophesied, “For a child is born to us, a son is given us; upon his shoulder dominion rests. They name him Wonder-Counselor, God-Hero, Father-Forever, Prince of Peace.” (9:5), and “He shall judge between the nations, and impose terms on many peoples. They shall beat their swords into plowshares and their spears into pruning hooks; one nation shall not raise the sword against another, nor shall they train for war again.” (2:4) .
December 23
O Emmanuel: “O Emmanuel, king and lawgiver, desire of the nations, Savior of all people, come and set us free, Lord our God.” Isaiah had prophesied, “The Lord himself will give you this sign: the Virgin shall be with child, and bear a son, and shall name him Emmanuel.”
(7:14). Remember “Emmanuel” means “God is with us.”
Father Saunders explains the O Antiphons very clearly here along with the appropriate scripture.
The symbols of the antiphons and explanation here via Catholic Culture
Here are some delightful crafts and antiphon activities!
Antiphon Guide from O Night Divine!
Just Another Day In Paradise: O Antiphon Activities
“O Antiphon” House « Our Domestic Church
By Sun and Candleight o’ Antiphon House
Heart of My Home
Shower of Roses
St. Athanasias Academy
O Antiphon activities!
O’Night Divine – the symbols, the prayers, and links for the O Antiphons!
Fisheaters has the actual chants in Latin for download!
or get a CD
Tons of good resources at Illuminated Ink!
Also the Christmas Novena can be started today!