I just made a delicious strawberry orange julius, and I thought I'd better share.
6 oz frozen orange juice concentrate
1/2 cup milk
1/2 cup non fat plain yogurt
1 cup water
1/2 cup agave (you can use sugar)
1 tsp vanilla extract
ice cubes (I like mine thick, so I added about 18 ice cubes)
Mix in a blender until smooth. Enjoy!
I think next time I'm going to use more yogurt instead of the milk. You can do it the other way around, too.