I'm raiding hardmodes (just to stop all who tell me that I'm a LFR-only player and should try the "hard stuff" before making suggestions) and I would like to see the whole gear be one color for all gear.
We have the itemlevel to see if it's good or bad. green/blue/purple lost its meaning long ago (purple = loot you only see very seldom, blue = loot that that is rare and uncommon). Make all gear green. From the first Level 1 robe up to the level 600 cloak from the prince. Just all green (or purple if you like that color better).
The only relevant thing today is a) itemlevel and stats b) design (my Hunter is wearing Lev70 pvp style for that reason)
We already play a game where loot that is hard to get like rare pets, rare funitems and rare transmogitems are often of blue quality while you can buy epic loot for gold or some easy-to-farm points or get a pair of epic boots for doing 1 point of damage on a worldboss a few seconds before some other raid is killing him.