Magic Scroll (kGE) features some new Santa costumes for Calyce, Grace, Adelina, and Emilia during Dec 16-24, 2009. Also available is the Santa Grabber pet, which loots and drops Christmas gifts (during Christmas period only).
See also Magic of Christmas in kGE forum topic for more screenshots. I don't usually post about kGE Magic Scroll, so this is a bit late. Well, better late than never. The new Santa costumes are somewhat significant after all, since the previous post is about GE Christmas.
Edit: For more screenshots of these costumes, see プレゼントでしゅ。ごしゅじんたま.