Moonphase has a list of some of the sites that have 'Nengae' or 'Special New Year Images', which usually involve a work-safe picture of a popular character dressed in a kimono surrounded by new year symbols. Now, Moonphase is very much sparkly-moegirls-yay (but it is the best anime news site I know of), so I'm not going to post ALL of them, just a few. If you have a favourite BL series, chances are it won't be there and you should check yourself.
All pages are home-safe right now unless otherwise stated, but I don't recommend looking at the REST of these websites unless you're prepared for what you might find.
Stuff I found out myself: NEW BL ANIME (OAV)! By the same company that brought you Sensitive Pornograph, this is based on a manga by Yamada Yugi-sensei called 'Saigo no DOOR wo Shimero! Act. 1' ("Close The Final Door! Act. 1"). I have very little idea what it's about, but if it's as good as SP, it'll be hysterically funny. Actually, the short summary makes it sound stupid, overblown and cute. AWESOME. Unlike SP, however, the seiyuu are not in disguise. They are Suzumura Ken'ichi-san, Morikawa Toshiyuki-san, Toochika Kouichi-san and Takimoto Fujiko-san. Released 23rd March.