Cover Characteristics: Book Covers featuring Water

So this week's topic is water. Water? WATER? WATER??? Do you even know what this topic did to me?! There are even more book covers with water than there are with keys! There are covers with boats and mermaids and beaches and storms and my poor indecision-addled mind couldn't take it! Then I got all perfectionist about how cool it was that they were almost all blue, but the shades of blue didn't...