The size of the throw pillows matters a great deal. If you have a large sectional sofa, bigger throw pillows, perhaps around 20 to 24 inches square, can make a bold statement and fill the space nicely. They create a more substantial and luxurious look. On the other hand, for a smaller love seat or a petite sofa, smaller pillows, like 16 to 18 inches square, will be more proportionate and won't overwhelm the furniture. You can also combine different sizes for an interesting visual effect. For example, place a few larger pillows at the back and some smaller ones in the front to add depth and dimension.

The color and pattern of the throw pillows should complement the overall style and color scheme of your living room. If your sofa is a neutral color like beige, gray, or black, you have a wide range of options. You can choose bold and vibrant colors like deep blues, rich reds, or bright yellows to add a pop of color and make the sofa area a focal point. When it comes to patterns, a solid-colored sofa can pair well with patterned pillows. Floral patterns can bring a touch of elegance and femininity, while geometric patterns can add a modern and trendy vibe. However, be careful not to overdo it with too many clashing patterns. If you have a patterned sofa already, it's usually better to opt for simpler, solid-colored pillows to avoid visual chaos.

The fabric of the throw pillows impacts both their look and feel. For a soft and cozy touch, materials like cotton or velvet are excellent choices. Cotton is breathable and easy to clean, making it practical for daily use. Velvet, on the other hand, has a luxurious texture that gives a sense of opulence. If you have kids or pets at home, you might want to consider durable and stain-resistant fabrics. Faux leather or outdoor-grade fabrics can withstand more wear and tear and are easy to wipe clean.

The filling of the throw pillows determines their comfort level. Down-filled pillows are extremely soft and plush, providing excellent support when you lean against them. However, they may need to be fluffed regularly. Polyester fiberfill is a more affordable option that also offers good shape retention and is hypoallergenic for those with allergies. Memory foam fill can conform to your body shape, giving a customized level of comfort.