I am thinking of toggle skills that would somewhat mimic combat transforms like the Warrior’s rampage, various weapon kits or the Norn’s spirit forms.
These skills would cost a great deal, 200+ (400+?) skill points and a bit of other materials.
Functionally, these Ultra-cost skills would be just cosmetic. Thus, letting some people run around as a Norn-bear but be no more combat effective than a Norn with a greatsword.
Possible examples …
Sylvari turns into a Husk or Oakheart
Human turns into an avatar of one the Six gods (separate skill per god)
Asura gets into that battle-suit and just doesn’t leave.
Norn-bears! Norn-ravens! Norn-wolves! Norn-panthers! Oh my!
Charr start the whole claw/claw/bite routine.
Mist were-wolf form only available by grinding some good old sPvP or WvW.
Elemental forms requiring pushing an event chain to obtain.
Finally, these toggle transforms would be functionally similar to Engineer kits or Elementalist summoned weapons. Thus, they would change the appearance of the character and the first five skills on the action bar. Most of these could easily use current artistic assets and duplicate current action bar skills for balance.