In a large bowl, cream the shortening and sugar until light and fluffy. Beat in eggs and vanilla. Combine the flour, baking soda and salt; gradually add creamed mixture, beating just until combined. Stir in bananas. Fold in blueberries.
Pour into three greased 5-3/4-in. x 3-in. x 2-in. loaf pans. Bake at 350° for 30-35 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks. Yield: 3 mini loaves.