RE: Orange Julius - I remember having one after my piano/keyboard lessons in the mall in Seattle. Took lessons at the Yamaha store there, and the Orange Julius stand was right across the way, along with an ice cream stand. -The ice cream stand had some "interesting" flavors back then - I was only nine - such as "bubble gum" (which had real pieces of bubble gum in it), and "black licorice" (boy, would that make your mouth a most unpleasant color).
There was - and perhaps still is - and Orange Julius stand in Tyson Corner Center in Fairfax, VA. When I was in high school, that was where I got my OJ fix. And, actually, when I was in Atlanta for SETCs back in March, I had an Organge Julius at the food court near the hotel.
And, yes, it's orange juice and milk (product/powder). Just think of it as slushy orange sherbet. *Heck, the Farmer's Lemonade I had last week was lemonade mixed with yogurt. It worked for me.