Enjoy your fruit juice but keep calories in check by mixing it with seltzer. Make a pretty garnish by freezing big, plump fresh raspberries (already-frozen ones don't look as nice.)
If using fresh raspberries, freeze them in a single layer for about 1 hour (or overnight) before proceeding with Step 2.
Combine cranberry-raspberry juice, seltzer and lime juice in a pitcher. Divide among 4 ice-filled glasses. Garnish with frozen raspberries and lime wedges.