In this image an ocean shader was used. However in the following a simple plane was used, and the caustics are generated by a simple caustics map in the relevant slot in an omni:
Which is better? I think it depends. The render time was unbelievably fast on the second one, as all the effects are faux. It is also more stylised, however the lighting is not true to the geometry. May attempt an animation to test realism.
Another similar image:
Edit: Found this free open source caustic map generator for animations!
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