We didn't decorate the tree this year. We have a pre-lit tree and just didn't bother to put up the ornaments. It's in a darker room (family room) so we just leave the lights on all the time and you can't really tell.
We didn't put up any other Christmas decorations. Just a lit, bare tree. Actually, the kids put it up while I was gone one day, so that means I didn't personally put up ANY Christmas decorations.
The big one:
We didn't even get the nativity scene out. It almost seems like a sin and weighs on me...but now that today is the first day I've got time to do something like that, it almost seems anti-climatic to do it after Christmas (although the Christmas season lasts for another 2-3 weeks.) I keep looking at the clean, bare mantle and feeling - bad. I just don't honestly think too little too late would help at this point. My kids all said they had a great Christmas...I still feel bad. False guilt? Reasonable guilt? I don't know...