http://www.eeschenck.com/i/0/pattern...20Serenity.pdf
It's very pretty, and they show it in shades of taupe and lavender.
Holly Taylor (who designs for Moda) often includes beige and dusty lavenders/purples in her collections, and I think those would also work very well for this pattern.
And of course, you can be creative and choose any two of your favorite color families and your quilt will be equally lovely!