I was looking for a favourite short poem & came across this rather generic website, but it has a bunch of nice quotes that could make good filler, or be expanded. I'm assuming you don't want JUST facetious pieces? http://classiclit.about.com/od/christmasliteratur1/a/aa_christquote.htm

"Sing hey! Sing hey! for Christmas Day!
Twine mistletoe and holly.
For friendship glows (I've heard "grows" also)in winter snows
And so let's all be jolly!" Anonymous