On Oct. 17, 2012, during its 174th orbit around the gas giant, Cassini was deliberately positioned within Saturn's shadow, a perfect location from which to look in the direction of the sun and take a backlit view of the rings and the dark side of the planet.
MORE: http://www.sciencedaily.com/releases/2012/12/121218153633.htm
See also...
A Cosmic Holiday Ornament, Hubble-Style
http://www.sciencedaily.com/releases/2012/12/121218094212.htm