This link has suggestions for making an O Antiphon House – each day, you open a window, read the title, one of the seven Messianic titles from the Old Testament to address Christ, and look at the symbol.
This Advent, we have modified the activity. Each morning, we read the O Antiphon in Latin and in English, cut out the title and symbol and paste these onto Advent purple posterboard. We are building the poster as we go through these last days of Advent 2009. And displaying the same on the fridge, the hub of all activity.