1. In a large bowl, beat butter and cream cheese until smooth. Combine the flour and salt; gradually add to creamed mixture. Drop by scant tablespoonfuls into 36 greased miniature muffin cups. With well-floured hands, press dough onto bottoms and up sides of cups; flute edges if desired.
2. Bake tarts at 325° for 20-25 minutes or until golden brown. Cool for 5 minutes before removing from pans to wire racks to cool completely.
3. On a lightly floured surface, roll remaining dough to 1/8-in. thickness. Cut stars with a floured 1-1/2-in. star-shaped cookie cutter; cut 1/4-in. stripes with a small knife. Place stars and stripes on ungreased baking sheets. Bake at 325° for 4-6 minutes or until lightly browned.
4. In a small bowl, combine blueberries and blueberry preserves; spoon into half of the tarts. In another bowl, combine raspberries and raspberry jam; spoon into remaining tarts. Top with cut-outs. Yield: 3 dozen.