How to Use the 60:30:10 Rule to Choose Art The 60:30:10 rule is a classic design guideline used to create colour balance. 60 percent is the dominant colour in the room 30 percent is the secondary colour 10 percent is the accent colour This structure keeps your space feeling pulled together, even if your style leans bold, colourful, or eclectic. Gallery walls work beautifully with this rule, because artwork naturally slots into the 10 percent accent and ties the