Team Fortress has hats, Guild wars 2 has back items. You’re really missing out on something special here! I don’t mind if you make them available as drops or can buy them directly from the gem store. Please don’t put them in a BL chest with RNG attached.
Seriously, as an engineer I would like something that isn’t a quiver, a book or a backpack. Since they’re just skins you can have your artists work on these, providing a bit more income without affecting the game.
Please consider this request.