".......Although I did see a pic somewhere with a lil group of female bettas swimming together like a lil school."
that would be called a sorrority, since all the bettas are female (or at least i think that's why it's called that, lol). and yes, that can be done, providing each female's temperment is compatible for shared tank living. i tried with three older (6month plus) girls and it didn't work. females from the same spawn might do ok together, but the gals can be just as owly as the boys sometimes.