Many large toilet tiles are rectangular as an alternative to square, and some people look better spread tightly together, which has a fine line involving grout between these individuals. This works in particular well with sleek tiles. The reduced amount of grout between that glossy tiles, that glossier the tiles will probably look.
A dark grout might seem different, but so long as you don't look for a grout that is usually so dark this looks black, you ought to be fine.
A truly designer space can be achieved when tiling a bathroom, with relatively inexpensive tiles by using a large format white tile with a matching sized colour tile used as a contrast horizontally or vertically. White tiles can look a little clinical when used exclusively to tile a bathroom, consider using a striking contrast floor tile that matches some other fittings.
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