We are about half way through grouting. We started in the kitchen and dining hall, and then went into the hallway. We used an epoxy grout, so we don't have to seal it every year. But that means that the grout needs to be cleaned from the tiles immediately after applying it, otherwise the tiles will be covered with a shiny haze. The epoxy grout we use is Laticrete Spectralock in the sand beige color. It matches some of the shades in the tiles, and I'm very pleased with our choice.
Here's what it looks like in the hallway:
The grout in the back of the hallway. Closer to you are non grouted tiles