Thanks all for the outpouring of support!  I definitely will be looking into those.  My approach is for a ringed planet is to simulate the real thing, with the planet shadow on the rings and ring shadows on the planet.  Some setups cannot do this.  I have one that uses populations of extremely large and numerous rock objects with camera projections.  No idea how that works.
And Mick - it's supposed to be a frozen lake, but now I like the idea of salt flat better!