Over time, Blizzard has put some of these tints on later rewards, such as Plundered Paragon's Mace from Islands being a recolor of Kri'tak, Imperial Scepter of the Swarm, but others never had a source until now.
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In Timerunning: Pandaria, players can collect a new fourth tint for Mists of Pandaria raid weapons. As MoP raids only had three difficulty tiers, there were some excess weapon tints that never made it into the game.