From the White House Historical Association website:

The White House Historical Association's Official 2021 White House Christmas Ornament commemorates the presidency of Lyndon Johnson. 

One side of the ornament features a painting of the Blue Room Christmas Tree. In 1967, Mrs. Claudia "Lady Bird" Johnson requested that Robert H. Laessig, a designer for American Greetings, create a painting showing the official Christmas tree in the Blue Room for their Christmas card that year. The resulting 1967 White House Christmas card was sent out by President and Mrs. Johnson to White House staff members, family, and friends. The ornament additionally features a border with Texas bluebonnets, one of Mrs. Johnson's favorite flowers and a symbol of her dedication to gardening and wildflower preservation.

On the other side of the ornament, there is a quote from President Johnson: "Our mission is at once the oldest and the most basic of this country: to right wrong, to do justice, to serve man." The president spoke these words to a joint session of Congress on March 15, 1965, calling on legislators to support a bill that would protect the right to vote and outlaw discriminatory measures that were preventing African Americans from voting. Johnson's speech was a direct response to the violence in Selma, Alabama, where Civil Rights activists were attacked by law enforcement and counter-protesters while crossing the Edmund Pettus Bridge.