Contact Delphi at www.delphiglass.com. They used to sell a grout colored additive/various colors for a reasonable price. Some people just buy colored acrylic paint and add to grout and I have read that this can be done successfully. I have also tried it myself without any problems. You can buy acrylic paints at Walmart in the craft/sewing section of the store. The prices range from $.44 to $.97. You may have to mix several colors to get a match. Good luck!