I made a animation with blender, showing some water dropping from a leaf. This took me a while to get it right, because first the water fell througt the leaf. In the end I dublicated the leaf and extruded the copy to make it thicker. I used the copy as the obstacle but made it invisible in the final render.
Also make sure to click "receive transparent" in the shadow block of the leaf material, or else the water will make a solid gray shadow - which makes the leaf that shines trought the water appear dark gray.
you can download the blender file here