I've never actually decorated a "birthday person's" chair, but the thought of creating a "birthday throne" sounds neat. Perhaps you could attach poster board to the back, in the shape of a throne, and write the birthday person's name at or near the top in pretty letters in their favorite color, of course.
You could decorate the "throne" posterboard with stick-on jewels, glue and glitter paint, too, of course, and helium balloons also work. For the balloons, though, you might want to find a way to prevent them from getting annoying. Attaching them to the very top of the "throne" should keep them out of the way.
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