The Atrium at the Museum of Modern Art has three pieces by Ellsworth Kelly in May 2012.
They have many more of his pieces not on display.
Ellsworth Kelly, 1986, Three Panels: Orange, Dark Gray, Green
Oil on canvas, three panels
Ellsworth Kelly, 1951, Colors for a Large Wall
Oil on canvas, sixty-four panels
Ellsworth Kelly, 1957, Sculpture for a Large Wall
Ellsworth Kelly at MOMA: