

Make Rectangles
Make a 5 × 5 inch rectangle with the Rectangle Tool (m). Or click on the artboard with the Rectangle Tool to bring up the Rectangle dialog box to enter dimensions. Make the fill 100% Cyan with no stroke. Copy (⌘c) the rectangle and Paste In Front (⌘f). Select the copied rectangle and make the fill white and the remove the stroke.


Effect
Navigate to Effect > Texture > Stained Glass. When the Stained Glass Effect dialog box opens, change to following setting:
• Cell Size = 46
• Border Thickness = 15
• Light Intensity = 5


Navigate to Object > Expand Appearance. With the texture still selected, set the Control Panel defaults to the Live Trace options. Click the arrow beside the Live Trace Button and select Tracing Options. Or go to Object > Live Trace > Tracing Options. Change the following options:
• Mode: Black and White
• Path Fitting: 1px
• Minimum Area: 1px
• Corner Angle: 1
• Ignore White: Check this box

Save this preset in the Tracing Options. It makes it easy to recall the setting. Next, Press the Expand button.

Simplify
Without leaving the selection of the texture move to Object > Path > Simplify. In the Simplify dialog box, change the Curve Precision to 70% and the Angle Threshold to 0 and press OK. Next, change the colour of the texture to 70% Cyan in the Colour Panel.



Offset Path
With the texture still selected, move to Object > Path > Offset Path. In the Offset Path dialog box, change the Offset to -0.03 inches and press OK. It creates a condensed copy of the original path. Ungroup (⌘ shift g) the original texture from the condensed texture by going Object > Ungroup. Do this two times to completely ungroup the original texture and the condensed texture. Once ungrouped, choose the condensed texture and change the colour in the Colour Panel to a 25% Cyan.


Depth
To give more depth to the water, Copy (⌘c) the original texture, Paste In Back (⌘b), rotate 90 degrees form the Transform Panel, and change the colour to 85% Cyan.

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