We do put up a tree. Always a real one until this year. I got so tired of hunting for a real tree and bringing it home (by myself), that I bought a pretty artificial the day after last Christmas. So, it's still in the box but will go up this year.
No theme... I like multicolored lights and ornaments. Whatever I like and/or is meaningful to me, I put on the tree.
I think I forgot to put any preferences in my swap info... I really don't have any, but I do love gingerbread and animals. Also stars...