The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
New to the series? Read our spoiler-free review of A Game of Thrones.
[Note: This message relates to various heraldry fiddlings that were being worked upon. The message has been edited for brevity, focusing on the interesting thematic statement made.]
If not, maybe we could suggest a weirwood by making it a white tree on a black eschutcheon. The Blackwoods are one of the few southron worshippers of the old gods, after all.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.