Try these four quilters: NedRa Bonds, Sonié Ruffin, Sherry Whetstone and Michele David.
The New England Quilt Museum (NEQM) had an exhibition of African-American quilts a few years ago (Oct 21-Dec 31, 2010) entitled
"African-American Quilts Today: A Celebration of Motherhood, Sisterhood, & the Matriarchy". Guest curator was Dr. Pearlie M. Johnson and the above named quilters were featured.
http://www.nequiltmuseum.org/past-exhibitions.html (far bottom of the page includes the promo blurb and one photo)