We want to see your Autumn hairstyles, so we're kicking off a month-long Instagram challenge. Snap a picture of your hair and share it with us. For every Instagram photo tagged #bellahair, BellaSugar will donate $1 to the American Cancer Society on behalf of Pantene Beautiful Lengths — plus you could win one of four $1,000 prizes! Our challenge's first theme was hair color, so flip through to see some of our readers' best shots. Ready to help the cause? This week's theme is hair accessories. Tag your Instagram snap with #bellahair, and you'll be entered to win!