Just casting my mind back to a very financially difficult time in my life, which fortunately is far behind me now, and remembering what I did for Christmas day.
Cheap nasty spirits made into cocktails. If you make strong tasting fruity ones you can't really tell what quality the spirit is. I always preferred this to drinking very cheap wine or beer, which I think you notice a lot more.
In mid December I went on a hunt for pine cones and fir trees branches to make decorations. The smell made up for the fact I was using a plastic tree. I would have done the dried oranges in the oven but oranges are expensive so I left it. Also made some salt dough Christmas baubles. Painted them with poster paint and glitter glue and hung them on the tree with string. They looked surprisingly good! You probably don't believe me but they came out quite shabby chic/hipster.
Making presents for people, or regifting stuff that I had lying around that had never been opened/used. It doesn't sound great but sometimes it could be something the other person would enjoy. As long as you choose carefully and present it nicely, I think it's fine. I made chocolate truffles for people who weren't immediately family but I still needed to do gifts for.
For Christmas dinner I did a roast chicken that was marked down on 23rd Dec. Absolute steal compared to a big ham or a turkey! It had actually passed it's BB date by 24th but was still fine on Christmas day. Made my roasties with sunflower oil because that's what I had in. Made a fairly normal but very tasty gravy with the roast juices, as you would on a normal sunday. Used frozen veg from freezer to go with it. Had been gifted a panettone so had that with packet mixed custard for dessert.
I know some people will read all of that and think it sounds shit but I was really broke and I made it work. We listened to great music, watched Christmas films and got totally pissed. It was a welcome break from the misery of our circumstances at the time.
These days my life is very different and I spend more, but that's because I can comfortably afford to do so. There is no sense in plunging yourself in debt all for the sake of a day, that is usually remembered by the company and the atmosphere more than anything else. All I'm saying is that you really can spend as little or as much as you choose - don't get drawn into the competitive nature of it all. Your Christmas will be whatever you have the resources to make it, and it's got fuck all to do with what kind of Christmas your friends and colleagues etc will be having.