I am sure you can use any combination of fruit but this just happens to be the one I like:
1 c frozen peach slices (be sure to chop them up a little so the blender will blend them. This isn't an exact amount - I usually use maybe 5 or 6 slices.
1/2 c nonfat plain yogurt
4 or 5 large fresh strawberries washed and sliced
1/2 c fresh squeezed orange juice
1 pkg of Splenda (I know this isn't allowed in P1 but I have to have it)
I blend my juice, berries & peaches first and then add the yogurt. If you want more of a blended yogurt to eat w/ a spoon, up the yogurt a little and add just a few T of the juice. I prefer part of the fruit be frozen so it is really cold and more of a shake consistency. Once I tried to use all frozen fruit and my blender wouldn't blend it so if you only have frozen fruit, let part of it thaw or zap it in the microwave for a few seconds first. My boyfriend likes the above but throws 1/2 a banana as well.