A little bit of history to go with the art...
"The cry of 'Flower Power' echoes through the land. We shall not wilt. Let a thousand flowers bloom."
— Abbie Hoffman, Workshop in Violence, May 1967
From wikipedia... Flower Power originated in Berkeley California as a symbolic action of protest against the Vietnam War. In his November 1965 essay titled How to Make a March/Spectacle, Ginsberg advocated that protesters should be provided with "masses of flowers" to hand out to policemen, press, politicians and spectators. The use of props like flowers, toys, flags, candy and music were meant to turn anti-war rallies into a form of street theater thereby reducing the fear, anger and threat that is inherent within protests.