A blood-stained cloth blanket covers the spot alongside this car where a service station attendant was turned into a human torch late yesterday. Police said 42-year-old Carl P. Nickell of Willis, employed at a US-12 Expressway service station, was doused with gasoline and dumped alongside by the car. Flames from the burning body set fire to paint on the car, but the blaze was doused by state troopers. Police said Nickell evidently was robbed of about $70 before being murdered in an apparent attempt to make the death appear as an accident.