1 cup orange juice (or other fruit juice)
1 cup fresh or frozen strawberries (or other fruit)
1 banana (may omit or reduce)
6 – 8oz (3/4 – 1 cup) yogurt (opt)
2-3 ice cubes or about 1/2 cup crushed ice

Put ingredients in a blender.  Cover and blend until smooth. 

Sweeten with honey or sugar if you like.  You may also add supplements, such as whey or soy protein powder, or ground flax seed.  

Another option is to substitute milk or soymilk for the juice, or yogurt. Or, you can substitute a cold tea (eg. green tea) for the juice.

Frozen yogurt, sherbet, sorbet, or icecream can be substituted for the yogurt.

Peanut, or other nut butter; or cocoa or chocolate syrup are other optional additions, depending on the mix of ingredients, and what your particular tastes are.

Here are some other ideas:

Orange juice, yogurt, ice (opt)
Orange juice, peaches, optional banana, frozen yogurt and/or orange sherbet
Orange juice, strawberries, bananas, soy sorbet, ice
Orange juice, peaches, bananas, pineapple sherbet, ice
Orange juice, strawberries, peaches, banana, ice and a little honey
Orange juice, mangos, peaches, yogurt, ice
Orange juice, blueberries, strawberries, pineapple or raspberry sherbet, yogurt (opt), ice (opt)
Orange juice, strawberries, pineapples, bananas, pineapple sherbet, ice
Orange juice, raspberries, strawberries, raspberry sherbet, ice
Orange and pineapple juices, mango, strawberries, ice
Orange and pineapple juices, strawberries, banana, orange sherbet, ice (opt)
Orange juice and raspberry lemonade, peaches, orange and pineapple sherbets, ice
Orange and apple juices, strawberries, raspberries, banana, raspberry sherbet
Orange/mango/passion fruit juices, strawberries, banana, orange sherbet, honey to sweeten
Lemonade, strawberries, or strawberries and peaches, lime and/or pineapple sherbets
Lemonade, raspberries, peaches, and raspberry, orange and/or pineapple sherbets
Raspberry lemonade, pineapple sherbet
Pineapple juice, strawberries, blueberries, banana, yogurt, ice
Pineapple and orange juices, strawberries, banana, orange sherbet
Pineapple and orange juices, frozen yogurt and orange sherbet
Pineapple juice, strawberries, banana, yogurt, pineapple sherbet, ice
Pineapple juice, banana, coconut, frozen yogurt and pineapple sherbet
Pineapple and guava juices, strawberries, banana, pineapple sherbet
Raspberry juice, raspberries, blueberries, orange sherbet or frozen yogurt
Raspberry juice, strawberries, raspberries, lime sherbet or raspberry sherbet or pineapple sherbet
Raspberry juice, strawberries, banana (opt), orange sherbet, ice (opt)
Raspberry juice, strawberries, raspberries, blueberries, yogurt, ice
Raspberry and orange juices, strawberries, bananas, ice
Raspberry juice, raspberries, strawberries, bananas, yogurt, ice
Raspberry juice, strawberries, pineapples, raspberry and pineapple sherbets, ice
Cranberry juice, blueberries, frozen yogurt, raspberry sherbet
Cranberry juice, blueberries, raspberries, banana, raspberry sherbet
Cranberry juice, blueberries, strawberries, raspberry sherbet, yogurt, ice
Cranberry juice, pineapples, blueberries, bananas, raspberry sherbet, whey protein (opt)
Apple juice, strawberries, banana, frozen yogurt or yogurt and ice
Apple juice, bananas, raspberry sherbet, yogurt, soy protein (opt), ice
Apple and raspberry juices, raspberries, banana, raspberry sherbet
Apple and guava juices, strawberries, banana, frozen yogurt, raspberry sherbet
Apple and strawberry juices, blueberries, banana, raspberry sherbet, yogurt, ice
Apple and guava or just guava juice, peaches, strawberries, orange sherbet or pineapple sherbet
Apple and strawberry juices, strawberries, banana, frozen yogurt and/or ice
Guava juice, mangos, strawberries, bananas, orange sherbet, ice
Mango and passionfruit or mango/passion/guava juices, peaches, strawberries, pineapple sherbet or orange sherbet, ice (optional)
Passionfruit and mango juices, mangos, pineapple sherbet, ice
Passionfruit and mango juices, mangos, peaches, orange and pineapple sherbets, ice
Passionfruit and mango juices, strawberries, peaches, pineapples sherbet, ice
Papaya juice, strawberries, peaches, bananas, orange sherbet, pineapple sherbet, ice
Papaya juice, mangos, pineapple sherbet, yogurt, ice
Papaya juice, pineapples, bananas, coconut, pineapple sherbet, yogurt, ice
Papaya juice, strawberries, pineapples, pineapple sherbet, ice
Papaya juice, peaches, yogurt, ice
Peach juice, peaches, banana, orange sherbet, ice (opt)
Peach juice, peaches, raspberries, banana, raspberry sherbet
Peach juice, strawberries, banana, pineapple sherbet
Peach and carrot juices, peaches, strawberries, banana, orange sherbet, and a little honey
Blueberry juice, blueberries, banana, yogurt, ice (opt)
Grape juice, strawberries, peaches, ice
Acai berry juice blend, strawberries, blueberries, soymilk, raspberry sherbet, ice
Acai and apple juice, raspberries, bananas, raspberry sherbet, yogurt, ice
Acai and apple juice, strawberries, blueberries, pineapple sherbet, yogurt, ice
Pomegranate juice, strawberries, yogurt, ice
Pomegranate juice, strawberries, blueberries, raspberry sherbet, yogurt, ice
Milk or soymilk, blueberries, strawberries, yogurt, ice
Milk or soymilk, strawberries, banana, yogurt, ice
Milk, chocolate, bananas, yogurt
Milk, peanut butter, bananas, yogurt
Milk or soy milk, peanut butter, bananas, chocolate, yogurt, whey protein
Green tea, orange juice and lemonade, mangos, orange sherbet, ice
Green tea, soy milk, yogurt, ice (fruit optional)
Red tea, raspberry juice and soymilk, strawberries, rasberries, frozen yogurt and/or sorbet, ice