this one is simple and you can vary it to make it vegan by replacing dairy yogurt with soy yogurt. or make it with protein powder. honey give it a nice flavor too.
start with fat free vanilla yogurt. add some splenda. then ice and fruit. frozen fruit is even better and you can skip the ice that way.
the orange julius: frozen pineapple, banana and OJ
berry blast: frozen blue berries, strawberries, etc...
classic: banana and strawberry