Personally, I think it's about time for gear found in older content such as Coil, Labyrinth of the Ancients, and the older HM dungeons (Hussar, Shikaree, etc.) be made dyeable.
I enjoy a portion of the older gear styles and think they should be dyeable after a given time. On the plus side, this gives players another reason to run old content aside from relic/quest grinds.
What do you think of this and what would you like to see given this option?