This is a political design. The use or lack of colour helps extenuate the point the creator wants to create. The use of flowers, as a severe contrast to violence and war, also shows the message of peace, not war. Powerful visuals in a simple way.
"Bombing For Peace Is Like Fucking For Virginity." This was on a sign in the during during a Vietnam War protest. This photograph represents the opposing views that many Americans during this time had against the Vietnam war.
"Power to the People: POWER & EQUALITY," social protest for the rights of African-Americans in graphic design posters. Silk screen poster designed by Shepard Fairey. Bold colors, simple shapes, and the lines really draw the eyes inward.