The People History Forgot Paul Rucker's Forever commemorates civil-rights martyrs with a stamp.

Pratt Fine Art Center's namesake, Edwin T. Pratt, whose life’s work addressed racial inequities in education, housing, employment and many other systems until his assassination in 1969, is now featured on a Forever stamp.
"In Forever, which is currently on view at the Greg Kucera Gallery, Rucker constructed 15 commemorative stamp prints out of aluminum. Eschewing "traditional" subjects like presidents, state flowers, and American flags, Rucker opted instead to place the faces of civil rights–era activists, schoolchildren, and falsely accused teens who were murdered or framed by white supremacists."

via The Stranger