I would like to see a wider variety of skins for my gear in the future, even if they are not from collected items but as rare 'patterns' to be found as drops or awarded for completing hidden objectives.
Also wings,tails, halos, foot prints, vanity pets, and so much more could be implemented in this fashion.

I like my Male characters to be buff with bulky armour, I love how this has been implemented.
I like my Female characters to be a bit more seductive, somwhat revealing.