Bring 4 cups water to a boil in a 2-qt. saucepan. Remove from heat, and add tea bags. Cover and steep 10 minutes. Discard tea bags. Stir in sugar until dissolved; add orange and lime slices. Cover and chill 2 to 6 hours. Stir in ginger ale, and serve over ice.
Note: We tested with Celestial Seasonings Red Zinger Herbal Tea.