On Epiphany Sunday, our family has continued a tradition of reciting a blessing and marking the lintel of every doorway in our home (usually with chalk) indicating the year and the initials of the wise men (Caspar, Melchior and Balthazar): 20 C M B 12. CMB also stands for Christus Mansionem Benedicat, Latin for "May Christ Bless this House."
For more information on this beautiful tradition, the following website has some great readings and more information on this beautiful blessing: