8 oz Crushed pineapple in juice
2    Egg whites
3/4 ts Vanilla
1/4 c  Sugar
1 c  Water
1 c  Crushed ice

Blend on high for about 1 minute, maybe a little more if you want it less
frozen.

Try 1 cup frozen strawberries, thawed, instead of the pineapple for a
strawberry julius.

If you dont want to use the egg whites, you might try a product sold at
GNC, called 100% Egg Protein (vanilla flavor). Its mainly powdered egg
white, with vanilla flavoring and aspartame. It will make a great “julius”
of any flavour.
Careful, though-a little goes a long way. If you use a 1 oz scoop per
drink as the label suggests, the drink will be pretty thick. A tablespoon
may be enough.