It's also nice to have a piece of blackberry cobbler or pie just after they're picked. If you have more than you can use at once there are ways to preserve the harvest. The easiest and most versatile option is to freeze them. Another rather simple way to preserve them is to dehydrate them, either in a food dehydrator or a low oven. After they're dry, store them in an airtight baggy in the cupboard.
Dehydrated berries are great in cereal, or can be rehydrated and used like fresh berries.
They also take up less space than either frozen or canned berries. If you are so inclined, you can also make jellies, jams, syrups or preserves. Lay them out in a single layer on a cookie sheet, then put the cookie sheet and berries in the freezer. After they are frozen solid take a spatula and loosen them from the sheet, then transfer the berries to a freezer bag and return them to the freezer. This method keeps the berries from clumping together when they're frozen, and when they thaw look almost like the original, fresh berries.