From the official release announcement - New Chroma Packs Bloom:
"Celebrate the season with Bard Bloom, new floral flavors for the Wandering Caretaker’s base. If flowers and sunshine aren’t your style, Grim Reaper Karthus Plague and Dreadknight Nasus Plague can harvest the joy from any foe foolish enough to face you.
Champion base and skin chroma packs - 590 RP
Grim Reaper Karthus Plague
Let us know what you think about this selection of champ and skin chroma packs and who you think we should deck out in colors next! Got questions? Check out the Chroma Pack FAQ here."
*Notice that each of the Bard chroma also has appropriately recolored meeps!
[NOTE: The Shockblade Zed Charge chroma was also tested on the PBE alongside these three chroma packs but he was delayed! Look for them to release in a future patch.]
Have questions on Chroma packs? Check out the FAQ!