Grass is #233
One thing I've learned with water to give it a little realism....ice it one with a spatula then take your spatula and dab the tip of it in the "water" at the angle you want it to look like it's moving. 
When I make water I usually do two shades of blue and white. I just run all three in horizontal lines of no particular order then run a spatula over the whole thing horizontally to blend the colors.
I highly recommend piping gel for the water. I made a cake with water last week - I first put down blue fondant where the water was going to be. Then I tinted my piping gel blue, and just spread it over the blue fondant. Worked like a charm and people loved it! A pic is in my photos.
I really like the piping gel for water too. Remember not to mix until it is all one color or if you do add streaks of color with a toothpick to make it look realistic. HTH
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