Our design experts say complementary or contrasting colors are perfectly acceptable design options if you're concerned about a color scheme. Complementary colors will draw out the color of your leather sofa and make it stand out while contrasting colors will draw attention to the other furniture pieces in your living room. If you're more concerned about the shape of your side end tables, you should first consider the design of your leather sofa. If your sofa features hard lines, you should consider an accent table with curved lines such as a circular or oval shape. If the featured lines of your sofa are more curved, you could try a side end table that features straighter lines.