Grout plays a very important role in the design of your space. Before grout was invented, mortar took the place of grout, which is why dark grout with white subway tile reminds you of a more simple time in history.
The tile market today is complex, with many different materials, shapes, and specialty finishes, making grout selection a multi-dimensional and important part of your selection journey. Here is an example how the appearance changes dramatically based off grout color. This example is Artistic Tile's Estrella glass mosaic shown in three different SKU options, with three different grout colors.