Dissolve 2 package cherry gelatin with 2 cups boiling water. Add frozen strawberries and crushed pineapple. Pour half the mixture into a 9-inch square pan. Chill until firm, keeping remainder of gelatin mixture at room temperature so it will not congeal. When first layer is firm, spread with 1 pint of sour cream. Carefully spoon on remainder of gelatin mixture to make a layer. Chill until firm. Cut into squares to serve. (Can use whipped cream at room temperature instead of sour cream.)