Pickle them in flavored vinegars or liquor. You'll get to use the berries and the liquid for a long time depending on how strong you make the mix. Also if you have time and a budget you could try making some boose out of them, just fill up a jar with fruits and sugar(some vodka is optional) let it stay in a chilled(10 C) place for about two months. Boom homemade special fruit juice for fall and winter.