I've used three light ray effects to achieve this.
Light ray 1 highlights the ice geometry in Maya (highlighted with the red box below). I've set a key on the start and end of the timeline and moved the centre point, so that the light is animated.
I then applied two more light rays and set a key frame for the position and intensity. Having them staggered, and the intensity increase and decrease, gives the appearance of a droplet forming and then dropping
