One reason I shared few Christmas projects is that projects I did make this season were very personal and I didn't want to spoil the surprise. For my younger sister, I made a set of Harry Potter quote posters. We are both big fans of the books (and lesser fans of the movies, though one of these quotes is actually from the movie. It's a good quote, though.)
I used the same font as the books and left the posters in black and white, to look most similiar to the books. It's been a while since I've played around on illustrator or any Adobe CS products, but since making these I've done a few more projects that I'll be slowly sharing.
You can download the posters as pdfs here, posters are 11x17 prints. I'm sharing them freely, so feel free to use them in any non-commercial use.