Using a serrated knife, cut 14 slices (1⁄4-inch thick) from the pound cake. Return the remaining cake to the freezer for another use. Spread 7 of the slices with jelly. Top with plain slices. Trim off and discard crusts.
Using a 11⁄4-inch star cookie cutter, cut a star from four of the pound cake sandwiches. Set stars aside.
Cut sandwich trimmings and remaining whole sandwiches into 3⁄4-inch squares.
Into four 8-ounce parfait or wine glasses, place half the cake squares, half the blueberries, and 11⁄2 containers yogurt, dividing equally. Top with the remaining cake squares and blueberries.
Spoon dollops of the remaining yogurt on top of each parfait. Top each with a star and serve.
Add any other desired berries to top for more color.