FREE - Martin Luther King Jr. - Clip Art Posters - Black History Month. In this free sample: 2 Martin Luther King Jr. resizable posters (8.5 x 11"). Martin Luther King Jr. is part of the bundle 1,366 Images & Illustrations, which includes the following: Click links for full previews. • Heroes & Leaders• States & Places• Veterans & Memorial Day• 1700's - Colonies & Revolution• 1800's - Events & Monuments• 1900's - Progress & Determination• 2000's - Lif