Peony
From PyroGuide
Blue peony (long exposure)
A spherical break of colored stars.
The peony is the most commonly seen shell type, which is similar to Chrysanthemum, except the stars do not leave a visible trail of sparks.
Video
3" Red Peony - 1.87MB - A homemade peony shell with a tiger tail rising comet. Fired from a mortar rack with good old fashioned quickmatch fuse.