I agree with Cindi; it might be helpful to find out exactly what they mean by neutrals. For instance, I consider this quilt to be a pretty neutral quilt, but it does have some color.
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Alex Anderson wrote a book about using neutrals, and one of the things she said that I will never forget is if you use colors such as cream, beige, tan, taupe, etc., make sure you throw in white. Adding white to the mix will make the quilt sparkle. She had before and after pictures in the book that really proved her point.