It really feels silly that these purely aesthetic Gem Shop items are bound to a single character, only being made reusable if you use transmutation stones whenever you want to apply it to a new set of gear on a single character.
These items should be made reusable, in a fashion similar to the achievement skins. I know quite a number of players who would find it a much more attractive buy if they weren’t single-use only.
To a lesser extent, this suggestion would apply to the unlimited use resource gathering items.