YeaI would asume lightning would be one of the most difficult things to make. I think a combo of those two might do you fine with some epic glow effect painting. Might also try something like static grass with a bit of green stuff accents. Just got to find good static shots of the randomness of real lightning to go off of. that you can find lots of from movies to scenic shots. For something that happens in the blink of an eye people seem quite capable of capturing it.
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