The biggest trend in home decorating this fall is an emphasis on happiness, self-expression, color and creativity. Or as some have dubbed it after the feel-good brain chemical, “dopamine decor.” Does orange make you smile? Dress your kitchen in the happy hue. Love a variety of styles? Do a mashup. The dopamine references comes from fashion. Dawnn Karen wrote in her book “Dress Your Best Life” that wearing clothes in your own, individual style makes you feel good. Decorators and influencers say the same thing happens when we throw out old rules and step into a space adorned with personal touches. We’re more relaxed, they say. More creative.