Shoot it vertically, in natural light, on an overcast day, with no flash, aiming the lens at the center of the piece.
The best quilt photography advice I've ever found is from Holly Knott, a photographer who just happens to be a quilter.
http://www.hollyknott.com/stq/
There are also lots of product photography articles on Etsy and Handmadeology.
http://www.handmadeology.com/categor...tography-tips/
http://www.etsy.com/blog/en/2013/the...e/#photography