A yellow wedding card background will add a splash of color to your big day. This vibrant shade is a natural match for several popular wedding themes. Brighter hues are perfect for a punchy, modern design while muted tones will work perfectly with watercolor, spring, or floral designs. Muted yellows will also look gorgeous against white, brown, pink, or green. They can be used to brighten up save the date mailings, too, as they often feature black backgrounds.