Prepare pastry for pie according to package directions. Cool completely.
Spoon about 4 cups whipped ice cream into cooled crust. Half fill disposable decorating bag fitted with tip 32 with whipped ice cream. Pipe ice cream in lattice design across top of pie; pipe rosettes around pie edge. Position cherries on rosettes; sprinkle with chocolate shavings. Freeze until firm, 6 hours or overnight.