What can I include in my Christmas celebration that incorporates its traditional, non Christian roots?

As an atheist I’ve heard a lot about how secularists are taking the Christ out of Christmas and that we need to get back to the true meaning of Christmas. So I’d like to restore the most traditional (and consequently pagan) trappings of holiday cheer to my celebration.

To be clear I’m interested in any kind of Christmas/Yule/Saturnalia/Solstice/etc traditions from any religion, culture or corner of the world. It would especially neat if any of you have incorporated any into your own holiday celebrations.