To mix patterns in a traditional living room successfully, start with a tight, two- or three-color palette and vary scale and texture of fabrics. For instance, pair floral upholstery with striped or checked cushions in complementary shades like greens and browns. Repeating these colors ties patterns together seamlessly. Balance busy patterns with solid furniture or walls and use fabric DIY projects to customize window treatments or accessories, achieving a coordinated, sophisticated, and budget-friendly look.