So far I have not seen the application in the Kechara Pujas/Prayer Session for instance.
i) To signal the end of a meditation session you hit the singing bowl once.
ii) Some people will purify the energy of their crystals by putting in the bowl and playing the bowl,
ii) Some people would put chakras inside the bowl, play it so the energy of the buddha within the chakra is spread through sound to the environment you are in blessing it with the buddha's energy.
An article on singing bowls http://tsemtulku.com/resources/ritual-items/singing-bowls/