Nothing elevates an ordinary salad like an exotic flavored vinegar. And a tall bottle of brightly colored homemade vinegar is a gift that will be sure to impress. Making flavored vinegar is an easy project. Berry-flavored vinegar is a great one to start with. Mix four cups of blueberries, blackberries or raspberries-frozen is OK-with one cup of white wine vinegar in a large bowl. Mash the berries lightly to release their juices. Add the remaining vinegar to the bowl and cover it tightly with plastic wrap. Store in a cool, dark place for one to four weeks, stirring every few days and tasting weekly until desired strength is reached. When the vinegar is ready, strain it and pour into decorative bottles for giving. This recipe will yield about three bottles of vinegar.