Match grout color to the tile: If the grout color is the same as the tile color, then the grout lines won’t be obvious, and neither will the shape of individual tiles. The tile itself can be as bold or understated as you like with this approach; we’re talking attention-grabbing color, extravagant veining or a textured finish, for example.
Depending on the effect you desire, your grout choice can either match or contrast your tile choice. If you choose a visually elaborate patterned tile and you want it to be the focal point of your design, matching the tile and grout color is the way to go. Matching prevents the eye from being distracted from the pattern grout lines can create.
Your grout can be either lighter or darker than your tile — or the same color. It depends on your preference. When deciding on your grout color, consider the color, pattern, shape, and layout of your tile and how your grout color will emphasize or detract from these elements.
How to choose the right grout color for your tiles?
Your options include: Match grout color to the corresponding tile, so as to not introduce any new colors to the overall design that might not work. Use a single grout shade that will work for both tile styles — a mid-toned gray is a safe choice. If your color scheme permits, contrast your grout colors with the other tile colors in the space.
Remember these rules of thumb: By matching grout and tile colors, you can create a minimalist look with the grout lines fading into the background. Using contrasting colors for your tile and grout make for a more dynamic design. For a look that splits the difference, pair your tile with a mid-toned neutral grout color, such as gray.