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January Jones isn't as blonde as Stefani, but she still likes her hair bright. According to Pelusi, Jones would require almost the same process as Stefani. He also recommends, "looking at your natural hair color when coloring any part of your hair." For example, in this pic, you can see some darkness/roots near Jones' middle part. Pelusi says he would pick a color in the same family as the natural hair color, but for Jones' case he would make it much lighter.
Pelusi suggestion? "A lowlight in a deep blonde, but placed around the back of the head and underneath," and warns against placing lowlights near the face, since it would look too drastic.