If you can crochet or knit or sew, you can make hats, scarves, gloves/mittens for gifts. There are many patterns on the web that you can use.
The same goes for decorations, you can make snowflakes, garlands, ornaments from yarn or material.
I know I'm being a little vague but I don't know what your skills are and it makes it a little hard to be more specific. Hope this helps!!