it could be easier than you think! Currently I am working on making several banners for the forums, just to prevent having things go stale around here. examples can be found below. If you are interested Im currently using WoWmodelviewer so you can either send me your character info or URL and a pose you want, or i could livestream/desktop share through skype so we can figure things out.
Blank Character Banner
Aradine Character Banner
Lura Character Banner
Innokenti Character Banner
Hoz'Zuul Character Banner
Aleale Character Banner
Enki Character Banner
Zul'Weh Character Banner
Default Banner
Aradine and Innokenti Banner
Aradine, Innokenti, and Lura Banner