Seeing as no-one posted it yet I thought I'd put it up. It appears that there will be some Armor sets on Gem Store that are Just Cosmetic skins, Word is they also act as transmutation stones and can change your armor with just a simple double click of it.
I'm definitely getting the PrimeVal set for my Charr Warrior.
Edit: So I don't look like crap whilst levelling. Im happy this option is there.