Say cheese.
"On July 19, 2013, Cassini's cameras will be turned in the direction of the sun and will capture the Earth, alongside Saturn and its rings, in an event that will mark the first time Earthlings will know in advance their picture will be taken from a billion miles away."
Unfortunately you will need to be somweher near Africa and have a really big grin.
http://www.ciclops.org/view_event/193/?js=1
Taking it literally, a bilion miles is like driving from Land's End to John o' Groats and back again 830,000 times.