I will be appropriate and simply provide you with links to the heraldry that I found. They’re on the Citadel (www.westeros.org/Citadel) and I would love to see House Straasa’s arms be represented this way at some point. I will also say that I’m not going to include the links to the Starks, Arryns, or other major houses, because those are in the book already.
First up is House Wyl. Lady Saryah is daughter to Lord Feri Wyl (entirely fictional characters) and this is Vaughan’s foster house. The five men who accompanied Saryah, Norie, and Desmond Yronwood were clad in black and yellow, and the banner they carried looked like this:
http://www.westeros.org/Citadel/Heraldry/Entry/House_Wyl/
While we’re in Dorne, I will also post the banner for House Yronwood, because the link also includes some information that is relevant to Stephen’s knowledge of the house. For everyone else, well…you’ll now know what the Yronwood banner looks like, at any rate. Desmond likely was not bearing his own standard, but would undoubtedly have had the sigil emblazoned somewhere on his person or his horse. They are exceptionally proud, after all:
http://www.westeros.org/Citadel/Heraldry/Entry/House_Yronwood/
Here is House Royce of Runestone’s banner (Lady Delayne’s original house):
http://www.westeros.org/Citadel/Heraldry/Entry/House_Royce02/
Here is the Reed banner:
http://www.westeros.org/Citadel/Heraldry/Entry/House_Reed/
If you guys can think of anyone else in particular that you’d like to have referenced here, just let me know. Also, just feel free to browse the Citadel site. It’s pretty nifty.