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Pulse graham cracker pieces in food processor until ground into fine crumbs.
In a medium bowl mix graham cracker crumbs and sugar. Add melted butter and work into crumbs with a fork or fingers until well incorporated. Firmly press crumb mixture using hands or a flat-bottom drinking glass evenly into the bottom of cups or serving bowl or container.
Add blueberries in an even layer on top of crumb crust.
Add yogurt or pudding in an even layer on top of blueberries.
Add raspberries in an even layer on top of yogurt. Cover with plastic wrap and chill until ready to serve. Garnish with mint sprigs if desired.