I love particles in Blender
Just a particle emitter following a path, a turbulence field and some nodes to make the particles change their colours.
Initially the animation consisted of 450 frames playing back at 25 frames per second. I had to change this to 900 frames and 50 frames per second, because the distances between the places where the particles were emitted were too large.
Maybe I should have faded the particles out instead of just letting them disappear.