With a little extra effort you can combine different fruit juices. But remember to fill the tumbler to only a third of its height to allow for the drink to expand. Here are a few of the combinations I particularly like:

¼ of pear juice, ¼ peach juice and ½ ice cold milk
¼ of pear juice, ¼ cherry juice and ½ ice cold milk
¼ of strawberry juice, ¼ grape juice and ½ ice cold milk
¼ of orange juice, ¼ pineapple juice and ½ ice cold milk
¼ of pear juice, ¼ kiwi juice and ½ ice cold milk
¼ of peach juice, ¼ orange juice and ½ ice cold milk
1/5 honeydew melon, 1/5 pineapple juice, 1/5 papaya juice and 2/5 cold milk
1/6 papaya juice, 1/6 orange juice, 1/6 puréed banana and ½ cold milk