In order to get wings in GW the storyline has to be changed to such an extend that it would be easyer to give them as a sort of gift on say halloween or wintersday.
Maybe Anet can even bring out small item booster packs easily activated with adding a new key for let's say $ 5,- containing a small fairy hovering over your shoulder, a halo, armor glow like bosses (linked to profession), wings, glowing eyes (cool for elem.), other hairstyles, masks or jewellery.
Easily double click to take out or put away (must be able to use more than one at the same time though)
Anyway you name the possibilities...
Here are the wing concepts made with paint and a dodgy mouse, but it's just to give you an idea.

