To style IKEA Christmas decor in small spaces, anchor your design with a classic red-and-green palette and add one modern accent color for interest. Repeat three to five motifs across focal zones like shelves, tables, and windows to create a cohesive look. Use sculptural lighting like paper stars to add warmth without clutter, and choose playful, scaled-down accessories that fit the room’s scale, keeping the space festive yet cozy and family friendly.