I think MelissaRThomas covered it very well! :p
There are a lot of things you can do. You can put a marble threshold in the door frame, since they tend to be three inches wide it is enough of a break that you could use close enough in the laundry room. Of course this only works if the colors you are using compliment marble.
In my bathroom I am considering taking out the shower and tiling up the walls, then, well you know going European. They do not make the tile I have on the floor but they do make the same type in complimentary colors. So if I go ahead I am taking up the outside rows and mixing the colors into a pattern then taking another color up the wall. Kind of hard to visualize I am sure. So right now the floor is a shade of green with beige veins in it but not a lot. They still make beige and a rustish color tile and they have accent pieces that have all three colors in it. So the center of the floor would still be green, the outside two rows would be a green and beige pattern and then up the walls would be beige and rust in the same pattern about three feet up the wall, accent strips, then this really cool pattern that I cannot explain.
But you aren't doing walls....
Hopefully my point came across, you can think outside the box.