Combine first 5 ingredients in a medium nonaluminum saucepan; bring to a boil. Cover, reduce heat, and simmer 20 minutes. Cool to room temperature.
Spoon about 1/4 cup blueberry mixture into each of 6 shallow bowls, and top each serving with 1/4 cup raspberries, 1/4 cup blackberries, and 2 peach wedges.
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