okay, here is how it works.
start with: Render> and one of the following: gradient bars, bars, or one of the other render effects.
DOWNLOAD PYROCHILDS PLUGIN PACK! IT HAS RANDOM EFFECT!
then, do random effect at default settings (the ones it gives you)
repeat as many times as you want, using only random effect.
REMEMBER!: do not press ctrl+F when repeating random effect. it only repeats the previous effect, not makes a new random. remember to always go into your menu, random effect.