Place paper baking cups in muffin pans. Combine first 3 ingredients in a medium bowl; stir well. Spoon tablespoonfuls of pretzel mixture into prepared pans, pressing to cover bottom of cups. Bake at 300° for 8 minutes. Remove from oven; cool slightly.
Meanwhile, place orange juice in a small microwave-safe bowl. Sprinkle with gelatin; stir and let stand 1 minute. Microwave orange juice mixture at HIGH 30 seconds or until gelatin dissolves; stir well. Stir in lime juice; cool to room temperature.
Combine whipping cream and salt in a medium bowl. Beat at medium speed with an electric mixer until foamy. Add sugar, 1 tablespoon at a time, beating until soft peaks form. Gradually fold in orange juice mixture until combined.
Fill each muffin cup with 1/3 cup whipped cream mixture. Freeze 2 hours or until firm. Garnish with lime slices, if desired.