Virgin of the Sign
An icon I like very much is that of the Virgin of the Sign, which I display during Advent. Known in Greek as the Panagia, it depicts Mary with a superimposed circular image of the child Jesus. This is meant to depict Mary as pregnant with the Incarnate God.
The French Orthodox writer Olivier Clement in his book The Living God has some things to say about Mary and the Incarnation worth hearing during this season:
At once both God and man: this is the whole meaning of the Incarnation. The Virgin has become united to God by becoming His mother. In the image of Mary we accept and receive God, for God also becomes incarnate in us through the Holy Spirit. The aim of the Christian, of his struggle against sin to obtain God's pardon, is to allow the incarnation of the Word in his life--even in his body--to become apparent....
Christ, the living God, seeks us out to lead us back to His Father and to reconcile us with Him. It is He who will give back to us the lost image. He makes Himself resemble us so that we may rediscover our resemblance to God. He comes and looks for us like the lost coin, like the lost sheep. Let us agree to become once again children of light so that we may become like Him: "God became man so that man may become God." But, one might exclaim, how can we be so presumptuous as to believe that? Let us turn once again to Mary, the Mother of God, for she has fully accomplished this union with God and she is our guide along this pathway.