The nice folks at Twilight Novel Novice have posted some cool Christmas themed Twilight desktops which are kind of fun along with some graphics that could be used in personalized Christmas cards that are sure to make your fellow fangrils scream with joy and glee.
As for the kid with everythign "Twilight", why not expand the horizons? Here's a good list of other books, movies and even TV shows that might be of interest to a fan. I'd like to add Baz Luhrmann's "Romeo + Juliet" to the list.
And if you're still looking for something unique, be sure to check out eBay. There are thousands of "Twilight" related items and there's still a little time to shop and make the Christmas delivery cut-off.