Anna decided the lid to the Lego box was a changing pad for the pig the other day and then today she dumped out the Legos and made the box into a crib/cradle for the pig. She put the pig inside, picked it up and started swaying. So I started singing "Rock-a-bye-baby" and we played this game for a long time. She wanted to take turns "changing" her diaper on the changing pad and sitting in the box. She requests this game by saying "play rock-a-bye-baby."
Of course, she was not always gentle with the pig, but we've got time to work on that.