I've used a woven Indian fabric for the setting oblongs and the bulk of my African waxprints for the patterned oblongs. They are mainly from Magie Relph's African Fabric Shop and many are from Ghana.
I wanted to avoid both red white and blue and course feminine designs. Speaking of Magie I went to a workshop with her some years ago making a similar design but longer thinner oblongs and they were foundation pieced - very nice but time consuming. the pieces are cut 5" by 7.75 to finish at 4.5 by 7.25 and 12 blocks by 10 should end up as 54" by 72", one of the requested sizes.