If you're planning to expand your fall wardrobe, somber colors and '80s rock 'n' roll apparel should top your list. That's the style reflected at Colonial Mall-Decatur's fall fashion show Saturday. The mall's Teen Board strutted favorite cool-weather clothes from Sears, Parisian, Rainbow Fashions, Dillard's, Maurices, J.C. Penney, Pac Sun, Gap and Aeropostale. "All of our stores have really cute and casual back-to-school items," said Tammy A. Burks, marketing director at Colonial Mall-Decatur. Since the late '90s, most fashion trends have trickled down from adults to teenagers. Fall 2006 breaks this routine. Trends are starting with teenagers and trickling up...