For much of the past decade, the safest interior was also the easiest to reproduce. Grey sofas, pale walls, matching finishes and carefully controlled styling circulated from property developments to furniture catalogues and social media feeds. The look promised versatility and broad appeal, but it also made homes increasingly difficult to distinguish from one another. This week, three separate signals point in the opposite direction. Green is overtaking grey in a major furniture category. New research suggests that saturated color can produce stronger positive emotional responses than muted shades. At the same time, designers and consumers are showing a renewed…