I think if you use it sporadically on both dark and light it will give your quilt sparkle. i recently made Bue Betty for my Great Aunt and didn't have enough of a color, sooo, I substituted shite in a few place and it really looked great!
use the search at the top and type Blue Betty. Take a look at the pics and you will see what i mean about sparkle! I just love that word. tee hee