Using wooden balls for Santa's head, glue on a pair of jiggly eyes or paint some eyes. If you have Christmas clipart graphic images, you can cut out a picture of Santa's face and glue it to the ball. Glue the ball on the top of the ornament. Then add cotton to serve as his hair on the head, mustache and as his beard.
Baby boy clip art is the most wonderful way of splashing your work with images that you think can do the magic. It is also the cheapest and the most colorful way of doing so. Most of what you will find will be free printable art.
Some designers actually make their available online in its original format, so that you can download it and make some changes, as well as resize it, though most will only supply a high resolution version that can be used up to a certain size poster. A Google search for.svg clip art will give you vector art you can use in Inkscape, and in fact some of it is exceptional.