The exotic guns have cool unique scopes/sights and designs that you can see while in first person view. How about HUDs for exotic helmets? Nothing to crazy but enough to see that I'm wearing The Ram or the Helm of Saint-14. Maybe throw in some kind of visual aid depending on the helmet. There is this cool video on Bungie.net that kind of does the same thing for the MIDA Tool weapon.
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Great and fun idea! Even include different HUD perks would be sweet (like heat mapping to show the number of enemies behind walls or longer range HUD, or red dots (like blue friendly dots) instead of nonspecific quadrant range blocks).