It might be cool to have a turkey smiley. Thanksgiving is a holiday celebrated in both the U.S. and Canada, plus turkeys are discussed on this site a lot.
I think we have to be careful about the holiday smileys. We're on the internet and not everyone celebrates Christian holidays; it wouldn't be fair to exclude or include certain religions, and it wouldn't be community-like to promote only one religion by having official BYC Christmas smileys. I know that some people on BYC are Wiccan or pagan, for example. You can find holiday smileys on other smiley sites and link to them in your posts.