My DH and daughters love frozen blackberries and raspberries just to eat as a snack. We have to buy them here - but I place them in a quart size ziplock bag - they are one layer only so they don't freeze together. I have no idea how long they will last because they never say in the freezer longer than 2 weeks. When they are in season and a good price I will freeze them by the amount I want in a pie or cobbler.
My friend told me she used to do it to their peaches when her girls were little - so last summer my DH went away for a week leaving me with several boxes of berries - way more than I could ever eat before they would rot, so I did the freezer thing. Little did I know I was creating a new treat for them.