help making an image in photoshop

[Abyss]

I'm trying to create a 2000x2000 pixel image that is soley of the effect seen on the right hand side of the below image (the kaleidoscope of colours meeting at a point in the same colour). Any ideas how?

Cheers, Andrew.

Apologies if this is the wrong forum, wasn't sure which one to put it in.

 

[Abyss]

Cheers for the advice everyone. The image is not mine, I found it online. I just want the sunray effect that is depicted in the image.