For the foam, how about using warps in the areas of the rocks? I've never used
warps before, so I'm not really sure if it would work.

I've got an idea on how to do the foam, here's the pseudo-code:

difference

    {waves with slightly exagerated verticle scale      // red line on pic -
foam
        pigment{foam}
        }
    {Waves - as in the scene}                                       // black
line - water
}

The exagerated wave should only show over the top of the wave.

Hope this helps - if you want to do the foam.

- Nekar

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