There was a time when grout colour choices were limited, but no longer. In addition to the standard white and beige, you can find grout on the shelves of any home improvement store in a wide array of neutral colours like grey, mocha, and sandstone. You can also have an even wider range of custom grout colours created; if you can think of the colour, you can probably have a grout colour made to match. All of these options can make choosing a grout colour to match your tile challenging, unless you keep a few simple questions in mind.
Consider where the tile is being used. Is the tile going on your bathroom floor? Is it going to be a decorative accent on the wall of the guest bathroom? Tile in high-traffic areas should be grouted with a colour that is easy to maintain. White grout on a bathroom floor will most likely be a cleaning nightmare. White grout around a tiled mirror, on the other hand, might be acceptable.
Decide if you want a seamless look or if you prefer a contrasting look. If you are tiling your kitchen floor, for example, you may like the contrasting checkerboard look of white tile with black grout lines. However, in your spa-themed bathroom, you might prefer the tile to have a peaceful, seamless look.
Determine a budget for your project. If you have an unlimited budget, custom-made grout colours may be an option. However, if you are working on a budget, you may want to stick with neutral colours that can be found (for a lower price) ready made.
Consider what colours will complement your tile. If you have an earth-toned tile, a mocha coloured grout will give you a complementary (but contrasting) look, while a sandstone coloured grout will cause the grout lines to blend more. When working with tile that has a range of colours, it's generally safer to pick a grout colour that complements the lighter shades of the tile so that the grout acts as a neutral background.
Purchase samples of your top two coloured grout choices (if possible). Mix the grout and apply a small amount of each to a sheet of poster board to see the colour against a tile sample. View the sample board in the room where the tile will be placed, so you can view the grout options under the correct lighting conditions.