do you mean for the tree, mantel, outside, wrappings? If you have a mantelpiece that is a good place to start. Some things I have done are hang a wreath (so it is flat) over the d.r. t able. Make my own quilted Xmas cards. Wrap presents with just paper and put a picture of the recipient on the top (this tip is great for traveling)
Indoors, outdoors, to hang on the tree, for a table, ?? etc. We would love to share our favourite projects with you, but you need to narrow the category down to a more specific kind of decoration that you are wanting.
Here’s some ideas with dollar store supplies: https://www.frugalfamilytimes.com/2018/11/elegant-christmas-decor-crafts-from-the-dollar-store.html?m=1
Barbara: here are some great ideas!