My son often gets me a gift certificate to Joann Fabrics. I love it! I use it mostly for batting, thread, zippers, and other notions. If your aunt is a seasoned quilter, you might pick a color (her favorite, if you know it) and buy a variety of fat quarters or even yardage, depending on your budget, in that color. My mother does this for me now and then, and it's among my favorite gifts.