TODO:

Maybe apply a further additive blend on top of the color-mapped bloom
  That could help add whatever's missing visually to the raindrops

Deja vu effect: flashing rows
  Make them flash all the time
  Then use a thunder-like pattern to show and hide the flash

Sounds
  Raindrop sound
  Deja vu sound
  ripple sound
  And some kind of ambient sound that they play over