Puma, spring 2009 In the New Orleans tradition of lagniappe, here is a little something extra for your visual pleasure. Pictured are sneakers from the Roy Lichtenstein-inspired “Popart “line, as my son tried them on in the Philadelphia Puma store. They’re still available online ($50-$65)—happy shopping! Roy Lichtenstein (1923-1997) himself described Pop art as “not …