Lightning Effect
1)Open a new file, around 400 x 300 pixels (It could be any size)
with a white background.
2) Now set your foreground color to white and background color to
black.
3) Go to FILTER > RENDER > CLOUDS
4) Go to FILTER > RENDER > DIFFERENCE CLOUDS. So far, I have:

5) Go to IMAGE > ADJUSTMENTS > INVERT. Here's what mine looks like:

6) Go to IMAGE > ADJUSTMENTS > AUTO LEVELS. I've got:

7) If you want to change its color go to IMAGE > ADJUSTMENTS > COLOR
BALANCE. Here's my final product:

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