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The brilliance of 'Taste the Rainbow' is that it provides a consistent slogan and unifying idea for the brand's communications while being open-ended enough to inspire endless creative executions. It invites imaginative, unexpected, and even absurd advertising that's highly memorable and strongly linked to the brand.
You can see a collection of Skittles Taste the Rainbow ads here.

Snack history has everything you could ever want to know about Skittles (and more).