Bring samples home with you and try them out in the area(s)
you want to use the tiles to see if they go with their surroundings.
Also, consider how much traffic there is in
the area, because that will affect the color and durability of the tiles and
how easily they are to clean. Make sure
that they are sealed regularly too – more so floor tiles than wall tiles.
I would go with matte tiles on my floors and
the polished ones for my walls. Slip and
fall accidents are no fun!