Not rock but, Jimmy Buffett/Margaritaville. There are enough Parrotheads to propel one song into a lifestyle brand with everything from food/beverage, beer/liquor, clothing, furniture, bar/restaurants, housing communities, resorts/casinos, and now marijuana.
It would be a band pin based on fun - margarita glasses, beaches, volcanos, sharks attacking bikini clad girls, etc.
In a recent interview Buffett said unlike perception, his fan base is growing from the children of the children of his original fans. He no longer sells music to old guys in Hawaiian shirts, he sells escapism to everyone.