To my Pagan friends, "Blessed Yule".

To my Atheist/Agnostic/Humanist friends, "Happy Solstice".

To my African friends, "Blessed Kwanzaa".

To my Jewish friends, "Blessed Chanukah" & Shalom.

To my Christian friends (If I have any), "Happy Holidays".

To my European friends, "Happy Boxing Day".

To my Roman friends, "Blessed Saturnalia".