1. Make a new image, any size with a black background.
2. Using the "polygonal lasso tool", make a spikey looking shape. (click for full image)
   
3. Fill it in with the color of your choice and then deselect it. (CTRL+F)
4. Duplicate the layer. (PSP: Layer > Duplicate) (PS: Layer > Duplicate Layer)
5. Move the layer slightly to either the left or right.
6. Change the blend mode to overlay or screen.
7. Duplicate layer again and move it again so it's not lining up and change the blend mode again. Keep duplicating until you are satisfied.

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