Yes, there is a quest that drops a rainbow generator. Details here on MMO Champion, two items down from the notice that a Russian guild has taken down Nefarian in 10-man mode. Apparently the 25-man version of Nefarian is crippled by a respawn bug.
http://www.mmo-champion.com/content/2112-Guild-XP-Gains-Reduction-Nefarian-Kill-BRC-ToT-Loot-Rainbow-Generator-Comics
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