PoolSolar Cynergy has developed a self-contained, in ground, solar-powered LED light that can be used in residential, commercial, and city applications.  Eliminating the need for batteries, these solar LED lights use Nichia condenser technology to provide blue, green, white, halogen white, and red lighting.  With the simple design of having everything built in, there’s no need for complicated wiring, and they’re strong enough to withstand the pressure of a tank.  As you can see, the lights are embedded into the ground to create various design and lighting effects.  Initially a Japanese innovation, Solar Cynergy introduced the lights at Lightfair International 2007, and business has taken off!  I can imagine that the opportunities are endless with this kind of technology.  More images below.

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