1. Mix cranberry juice, vodka, amaretto, and orange juice in pitcher. Cover and chill until ready to serve. (You can do this 1 day ahead- keep refrigerated).
2. To make 2 drinks: fill cocktail shaker with ice cubes. Pour in 1 cup vodka mixture. Cover and shake vigorously. Strain into 2 martini glasses. Garnish each with clementine segment, if desired. Repeat 3 times with ice cubes, remaining vodka mixture and clementine segments.