A small experiment, which turned out quite well!
How it works:
a python script sets a random vertex color to white, another module fades all white vertices back to black.
The vertex colors are multiplied with a texture, then a threshold is subtracted (to add variation/density to fading).
Preview:
Download HERE
To decrease droplet size just add more subdivisions
Wow very cool! I love such experiments that turns into shiny things
Thanks 
I might add some soft particle rain in UPBGE to make it look really good!
Yeah, cool and very simple. 
I would never came to the idea to make it this way.
Thanks 
your collision shaders are very cool as well! It would be awesome to see more of them in action!
Thank you too. I already have made some improvements for the collision shader. I hope the update video and download comes soon.