In the time when Frank Sinatra was in his prime, people didn't really get tattoos unless they were in prison, or they were sailors. Because of that, Sinatra never got the honor of seeing people get his likeness tattooed on them in the same way that modern music and movie stars do, which is a shame. It's a testament to his legacy and enduring appeal that people are doing so now, though, so many years after he died.
As the kingpin of the Rat Pack, Sinatra was pretty much 'the guy' in the 1950s. He was the leading man that film studios wanted for their movies, and when they'd cast him in the film, they wanted him to sing the soundtrack. 'Sinatramania' happened twenty years before the Beatles had even picked up their instruments for the first time to spark 'Beatlemania'. His incredible voice is the sound of a whole era, and although many have impersonated him in the time since, nobody ever did it better than Ol' Blue Eyes.