I acquired a bonus granddaughter, ready made at age 5. I wanted to make her a doll quilt. I asked her her favorite colors, she said pink, blue, green, purple, and black. I scratched my head over it for a while, then bought bright batiks and solid black & made an amish style quilt, with 9 bright/black pinwheels, sashed in black, small black border, then 4 rows (one each color) of checkerboard, then an outer black border. The back was a batik in all the colors, and I bound it with that, too. Ended up 36" square. I make my doll quilts large enough to wrap the doll in.
It depends upon the child. I am sure there will be one child in the charity THRILLED with your bright/black quilt.