1970 - PJ (Parnelli Jones) Colt - Johnny Lightning Special
Perhaps the most styled and colorful of all modern eras at Indy, 1970 saw varied chassis designs and bright colors like never before. Of those designs, one stands out for me which is also the race winner that year: Al Unser's #2.
The last of the non-winged cars to win at Indy, this car repeated it's feat in 1971 with Unser at the wheel again. 1972 saw the allowance of 'bolt-on' wings (not integral to the chassis shape) which vastly increased cornering speeds while limiting drag. This Colt chassis was sponsored by Johnny Lightning, a toy car manufacturer was styled based on the company's logo. To quote Al Unser, "Hey, that's perty!"