The Party Blowout is an accessory.
Available Party Blowout Accessories
Prismatic Aspect: None
This accessory was first made available during the 1st Anniversary of Spiral Knights, and has been every anniversary since, though the acquisition method has changed.
A Party Blowout is part of a collection of celebratory accessories, which include Party Hats, Birthday Candles, Grand Toppers, and Party Blowouts, as well as Sprinkle Auras.