Grout manufacturers such as Custom Building Products, Mapei and Ardex offer ceramic tile grout color charts on their websites. Home Depot, which distributes grout from Custom Building Products, has a grout color card on its site.
Grout color charts range from bright shades of white to shades of black. The color card from Custom Building Products offers 40 colors in mostly earth tones. Mapei Grouts has 48 colors, including bright colors such as gold, red or jade green. Ardex's color palette offers 36 shades.
Grout can be mixed to produce new colors. The color chart is just a guide and the final result may differ because of the tile color, finishing techniques and job site conditions.