This lightning effect was created in Photoshop®
Open a new file, use the gradient tool (black to white)
and drag it from left to right.
Then go to your filters and use "difference clouds." its under render.
Then press Control-I to invert image.
Open the hue dialog box and select colorize in the right hand corner,
then move the saturation to under 25. Use the hue slider to get the color
Then select mode, "levels" and the dialogue box will open. (control L)
slide the middle triangle under the histogram, to the far right.
And now you have "Lightning" to use for an interesting
background or whatever.