I have used black.
Just as it is important to audition your fabrics ... it is important to audition your batting!
However, the problem that I have found is that when I do a check of all the fabrics in the quilt, there tends to be something lighter, that I fear the black will shadow through, and make it look grubby and dingy. I often fall back to the beige/natural at that point.
Nothing wrong with black ... but be sure to check before you proceed, so you are not disappointed later.