This command when triggered from a command block used to create a nice blue fireball, and now does nothing..

/summon FireworksRocketEntity ~-10 ~-5 ~10 {LifeTime:30,FireworksItem:{id:401,Count:1,tag:{Fireworks:{Explosions:[

{Type:1,Flicker:1,Trail:1,Colors:[255],FadeColors:[6442611]}

,

{Type:3,Flicker:1,Trail:1,Colors:[3746149],FadeColors:[4264969]}

,

{Type:4,Flicker:0,Trail:1,Colors:[16774935],FadeColors:[4803858]}

,

{Type:2,Flicker:1,Trail:1,Colors:[16712644,9990453],FadeColors:[14679905]}

]}}}}