The 60-30-10 rule is a classic design guideline to balance paint colors and décor. It means using 60 percent of your primary color, like Universal Khaki, 30 percent of a secondary color, such as rich woods or crisp white trim, and 10 percent of a bold accent like lemon yellow or oxblood red. This proportion creates visual harmony, ensuring the space feels grounded, inviting, and well-coordinated while allowing an accent to add interest without overwhelming.