sparkly noise for texture

  1.  Use something like Simplex 3D (GPU) noise. 
  2. Set the period to something quite low, so you get lots of noisiness. 
  3. Animate the transform Z with absTime.seconds.
  4. Plug it into a FUNCTION node
  5. In the Function RGB, select Input ^ Exponent
  6. Increase Exponent
  7. The lower values should now just be black & the higher values now pinging.
  8. Use a Level node to tame the opacity & composite it on top of something

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