You use them like any other reagents to evolve the wings. But not any wings, only the special wings with stats we haven't seen yet.
The ones I know about is:
The Green one "Lime Feather"
The Purple one "Violet Feather"
We probably will see a yellow one as well.
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The ones I know about is:
The Green one "Lime Feather"
The Purple one "Violet Feather"
We probably will see a yellow one as well.
In actual VIP event you can receive blue wings for spending 6500 Gems or golden for spending 13k Gems. Looks like another money making strategy.