This is one of over 4989 textures generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
With Filter Forge, you can:
To open this filter, you must have Filter Forge 1.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
'Caustics' is the name for those patterns of light created by liquids (or any other transparent or translucent material, actually), and that's what this filter simulates.
water caustics light pattern liquid wave waves
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.