My friend Kathy S. made this cute appliqued banner for her daughter's wedding this summer. She said:
The pinks and green fabrics were just cotton duck fabric. The navy and yellow were outdoor fabrics. I got the design from my computer clip art -- just enlarged it to make it work for the flag and made a pattern from newsprint. . . . The finished dimensions are 29" x 42" but I would add a few inches to both the width and length if I were making this again.