Color her bad.  Dixie Chicks banjoist Emily Robison recently hopped on the brunet bandwagon alongside Gwynie and Cameron, first hatching her new look at the Grammys.  And it's a move that's raised quite a ruckus.  Postings on the country phenom's official website are cautiously positive ("It's something we have to adjust to," advises Cowgerl 23).  But a prankster at Dallas' country station 99.5 The Wolf sprayed Robison's hair hot pink on a local billboard.  John Barrett, who owns a salon in New York City's Bergdorf Goodman, calls the new shade "a strikeout."  Chicks hair-stylist Melanie Shelley insists Robison went au naturel (with store-bought color, no less) "so she could be herself" during the group's recent hiatus.  An added perk: "She gets so much respect since she's gotten so dark."  Sounds like something any country girl would dye for.