Are you over orange as an autumn decorating accent? Bored with relying on balsam and fir touches to evoke a holiday spirit in your home? If cooler weather and the coming holidays have you looking for new decorating ideas, here are some trends that will be heating up interior design this year: Economize and simplify “People are starting to simplify their spaces by paring down their decor to items that show off their interests and personality,” says Nancy Hadley, a former design producer for Extreme Makeover: Home Edition, Trading Spaces and Kitchen Nightmares.