Solar Roadways LOL a silly suggestion that got a kick start ... So my silly suggestion is
why not have the Aussie solar Boomerang 
invent aussie solar boomerangs, its a toy, its fun , it beeps so you can find it in the aussie bush. or the beach.
its solar so that's so progressive so green. solar boomerangs will sell well

do not forget to add blinking LED's to it. tip: its a boomerang shaped pcb with mico embedded in epoxy resin.
aerodynamic shape optimization is very important here, so it will fly.
if you're clever you will not need a battery, as a super-cap will do , also do not forget to add boomerang buoyancy, can help at the beach.
foam packing inside the epoxy skin. see how are surfboards made ?,
so why not have your own eco solar flying thing - seriously People will buy this stuff, its fun.

I posted this in response to
more solar roadways LOL