I just discovered a new thing to love about smoothies...the boys can make them by themselves! I have always appreciated smoothies as a healthy snack or dessert and the kids all really love them. The fact that the proportions really don't matter and that the smoothie-maker gets to make a few decisions makes it all the more fun for the kids to make on their own. I get a kick out of hearing them negotiate the decisions...like how much of each ingredient they should add.
I keep bags of frozen fruit (strawberries, blueberries, raspberries, mango and peaches are all good) well stocked, as well as a large tub of plain yogurt. Either milk, orange juice, or a combination can be used to help blend it all together. The fact that the kids think smoothies are a "treat" is a big bonus too...it is a great way to add some healthy foods to their diet. And, more independence is good for all of us.