I played Hunter as a primary and Titan as a secondary. They had cool exclusives (cloak and sash respectively) but I never noticed the warlocks arm bands. In the thick of battle or movement in campaign/roaming, you don't have time to see a small ring around their arm. Maybe like someone said, a necklace, or maybe a scarf or their duster jackets or even a decorated sleeve of the jacket. You know? Something more noticeable.

Ya I would definitely prefer this over the bonds

Id prefer a sleeve,its noticeable and could probably give the warlock some more abilities.I do think that the same should go for the Hunters capes and Titans sash.The warlocks bond could be bigger or in graded in the sleeve,with the same design.