Or rather, I made some custom texture swaps that I would want my werewolf characters to look like in-game. Since there are no Skill Styles for the Werewolf Transformation Ultimate ability yet, I hope these designs can better illustrate some of the possibilities that Skill Styles for that ability can have. Further, I've included the actual modified diffuse texture files for the examples I'm showcasing, and I encourage ZOS to make use of them!

Style 1: Timber Wolf Werewolf
This changes the entire design into that of a timber wolf-like werewolf. Ideally, this Skill Style looks the same across all morphs of Werewolf Transformation, so you can look like this regardless of which morph you pick. This might change the Pack Leader dire wolves into timber wolves as well. If one aspect of this texture had to change between morphs, I'd make the eyes a different color depending on morph.
Diffuse Texture:
Style 2: Karthwolf Werewolf
This design adds red markings in similar positions to the Karthwolf Charger but on the werewolf model. This example uses the white fur as a base (since that's how the mount looks) but maybe the markings could be applied to the brown and black fur colors as well if this style overlays markings on top of the existing fur colors. The Pack Leader dire wolves could have the Karthwolf Charger design applied to them.
Diffuse Texture:
Thank you for reading my thread! Here's hoping us Werewolf players get some kind of cosmetic customization soon!