Hooray! I'm not the only polytheist on the board anymore!
I'm Kemetic and my husband is an atheist, but we still celebrate the season. I tend to focus more on the Yule aspects (just 'cause I've still got some Wiccan remnants floating around in my personal practice), but we put up a tree, decorate it (I have the entire run of Order of the Stick ornaments ), buy gifts for each other, etc. Our families are also all still Christian, so it's hard to completely disconnect from the holiday when it has such a strong family connotation.