Keeping on the topic of Thillonria, it's only fitting I help spread around the latest work Greyhawk Grognard has been doing on Greyhawk heraldry. Among his reproductions posted today are the heraldric shields of the Frost, Ice and Snow Barbarians.
While I'm at it, here is some assorted resources on Thillonria. All these fan authored articles can be found at Canonfire:
The Fall of Shakark: Thillonrian Myth (by cwslyclgh)
Rhizia: A History of the Northeastern Flanaess (by Hunter103)
Living Greyhawk Gazetteer Addendum: The Bitter North, Part I (by Cruel Summer Lord)
Living Greyhawk Gazetteer Addendum: The Bitter North, Part III (by Cruel Summer Lord)