In the cryptocurrency world, there's an interesting free money experiment being launched in Iceland this month: Auroracoin. http://www.auroracoin.org/

Auroracoin's goals are not quite as relevant for the US, since we don't have a public national ID database and our dollar is incredibly strong. But the distribution of a pre-mined cryptocoin could be one type of universal income. It's also a way to experiment with relatively few consequences to the existing economy.