Let me brainstorm aloud.

Water gives life, energy. It's pure, delicate, easily bent at will. Powerful and also soft to the touch, cooling and refreshing on the skin. Running water sound is calming, peaceful.

Honestly first words come to my mind about water are; peaceful music of water, delicacy of droplets, and purity of water itself.

May I suggest you to use those string waterfalls? They're actually thin, hard and glass-like tubes. Water travels inside the tubes to ceiling, and a mechanism lets small amounts of water fall down over the tube. Making it look like waterdrops are falling down from above. Small ponds of half glass spheres perhaps attached to wall or standing on floor? Water can travel between each. If this is somewhat a shrine, it requires a certain level of silence.

I just love throwing around ideas, hope any of these can help you. ^^