I think that since the armors and weapons all end up being generally the same as far as what everyone uses goes, the things that actually individualize us should be more unique. Most Warlock bonds are underwhelming, many of the Titan marks are rather dull and most of the Hunter cloaks are waaaay too similar. A lot of the shader colors can end up looking really strange with a lot of armors, and there is NO variation in sparrow design or functionality. Give us something to truly show our legends off. Something so seemingly minuscule can go a long way.
Unique class items for the top ten Guardians of each Crucible type that are lost if they lose their rankings.
A unique "medic" shader or class item for the Guardian with the most player revives in a month
Unique faction sparrows for those that reach lv 80-100 in their factions.
Raid completionist shaders, class items or sparrows for people that have gotten every reward from every difficulty of a raid.
Give us cool stuff to work for that *cough* won't get taken away every dlc/ expansion *cough*
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I say exotic shader, are kinda pointless. Exotic class items are inning in the taken king. And there already is an exotic sparrow. The dawnchaser. Nobody knows how to get it, no one has it, but it's in the games files, as a collectable object.