Patriotic Gelatin Salad

Directions

1. In 4 separate bowls, dissolve each package of gelatin in 1 cup boiling water. Add 1/2 cup cold water to each and stir. Pour 1 bowl of blue gelatin into a 10-in. fluted tube pan coated with cooking spray; chill until almost set, about 30 minutes.
2. Set the other 3 bowls of gelatin aside at room temperature. Soften unflavored gelatin in remaining cold water; let stand 5 minutes.
3. Heat milk in a saucepan over medium heat just below boiling. Stir in softened gelatin and sugar until sugar is dissolved. Remove from heat; stir in sour cream and vanilla until smooth. When blue gelatin in pan is almost set, carefully spoon 1-1/2 cups sour cream mixture over it. Chill until almost set, about 30 minutes.
4. Carefully spoon 1 bowl of strawberry gelatin over cream layer. Chill until almost set. Carefully spoon 1-1/2 cups cream mixture over the strawberry layer. Chill until almost set. Repeat, adding layers of blue gelatin, cream mixture and strawberry gelatin, chilling in between each. Chill several hours or overnight.