I made this in quite short time, i love the bg . It's just brushing. With the render overlay - 50% , and edited a bit. But lets not give away all the secrets
I think i coudl've done much better on the main render, but the centre looks good, it's meant to be fuzzy like an unstable energy ball.

( 40 mins this took approx )

Hope you like it...:

Outwards Explosion Link