Silent Night from 2k8 was always my favorite - I liked the little side cape and jacket they had going in that one. xD The black and silver theme was really nice too, because there aren't that many items on gaia that did that as well as Silent Night.
My favorite Monthly collectible is the Angelic Scarf, and in fact is also my favorite gaia item ever!
I wanted it in 2004 and it took me years to get it, and then my sweet boyfriend gave it to me.
I love that its a scarf, the color is pretty, It's hard to work with which makes it a wonderful challange.
I never take it off and I just love it! <3