Creating Transparent Water Effects

Graphics Shaders & Materials
1

I am looking to create something similar to this:
http://mirror2.cze.cz/textures/water-texture-3.jpg

But without the blue background, so just the whiter lines.
The aim of this ultimately is to use it with a multiple-pass shader and low-opacity colour balance to replicate the Portal 2 Emancipation Grill.
http://theportalwiki.com/wiki/Material_Emancipation_Grill

Does anyone know how to create a texture like this, or anywhere I can get one?

2

DIY - adobe photoshop - How can I create a large-size water caustics texture for animation? - Graphic Design Stack Exchange
Tool - Caustics Generator - Seamless water texture rendering