Start googling swamp trees everyone
I might be a bit late to the party, but i saw the shield art and thought i could add a few cents.
http://www.fabuloussavers.com/wallpapers/34_Tanzania_tree_sceniclandscapes_naturewallpaper_l.jpg
http://www.r-a-guthrie.com/images/WA165AM.gif
Tree as Lizzard(s) concept-
http://www.shiningsungardenworks.com/images/2_foot_oak_tree01.jpg
http://3.bp.blogspot.com/_bqCxQKDqifI/SJUnqYhGxOI/AAAAAAAAAac/0PaaIg79IPk/s320/TreeGoddess.jpg
http://thecoloringspot.com/images/animalpx/gecko.jpg as a http://2.bp.blogspot.com/_j1cdMMQnYns/SQT8Hq_trAI/AAAAAAAAEhs/7yzTRu_te2w/s400/tea+tree.jpg (compare)
What I picture for the crest is a Lizzard formed into a Hist. The tail as a deep root, legs as surface roots, body as a stout trunk, arms as most branches. And then something for the head. More branches?
I do not mean to criticize the earlier tree art, but the image seems a bit to...delicate, to represent argonians.