There's a company called Zelectric Motors that converts old VW bugs and buses into fully electrical vehicles. From Ars Technica:
The ZelectricBug starts off as an older (1958-1966) VW beetle. Out goes that old air-cooled engine, replaced with an 85hp (63kW) electric motor—double the horsepower of the original internal combustion engine—and a 22kWh lithium iron phosphate battery, good for between 80 and 100 miles. Zelectric also upgrades the transmission to cope with more torque (120ft-lbs/163Nm), and the batteries are said to be good for at least 160,000 miles.
A bit pricy, starting at about $50,000, but cool anyway!