For mulch that will go with your flowers, pick a color that works with your blooms.
White and yellow flowers look beautiful with red mulch. Purple flowers conflict with red mulch but look stunning against black and brown mulch. If you plant dark foliage or dark green colors, almost any mulch color will provide a nice contrast and help make the plants stand out.
To match a mulch color to your home, consider the style and materials used in its construction.