The homemade ornaments I show are good for gifts for others if you do not need them or could give ideas for decorative items in general, but I celebrate Christmas, so that is the context my decorative items and gifts are for.
I think Evergreens, fresh evergreen is physically very good for us at the Christmas or Solstice time of year. It is a very cleansing aromatherapy experience, also good for cold and flu symptoms, and so also likely helps ward it off. Eucalyptus would also fall into this category. If you dont have any of that, any fresh growth is good for the spiritual aspect of fresh life in the darkest days of the year. I was able to bring a whole tree in again this year, but if I couldnt, I would bring in lots of green branches, and in my area that would be fir, pine or eucalyptus.
Some ornaments use free materials, like dried wheat grass stems and thread