1. Start by creating a new RGB image. I used the dimensions of 288 x 288 in the example. Create a new layer. Choose any two colors; foreground and background.
Click on Filter > Render > Clouds
Click on Filter > Render > Clouds
2. Click on Filter > Distort > Pinch
Set the pinch value to 100%.
Negative value wont give that burst look, but result in something totally opposite. Give it a try ;)
3. Press Ctrl + F, a few times depending on how much burst you want in your image.
Ctrl + F ; is a hot key for reapplying the filter last used.
4. For the lighting effect, click on Filter > Render > Lighting Effects and set the values to your choice.
You should end up with something like this (shown on the left).
You should end up with something like this (shown on the left).
5. Make further customizations if you wish. :)
More Tutorials: 
