I absolutely love the MoJo smoothie from a local eatery. I think I have mastered it and my son loves it.
I recently bought a large container of kiwi and decided to chop it all up for smoothies. I also freeze rip bananas for this same purpose.
Blend frozen blueberries, strawberries, kiwis and a half frozen banana. Add a small amount of yogurt, milk, water and maple syrup. Purée until smooth.