How about a triptych with Timothy Leary and Ken Kesey?
Jerry Garcia was a heroin addict and his unfixed problem hurt his music and his band badly, setting a terrible example for youth. But with misgivings, I'm OK with the stamp. Hasn't Andy Warhol's art been on a stamp? Those who deify such flawed men and women are just stupid, but we can nonetheless recognize artistic contributions and greatness.