In the photo below notice how pronounced the octagon tiles appear with dark grout.
White subway tile with dark gray grout.
Well appointed gray kitchen features glazed white subway backsplash tiles finished with dark gray grout and framing a stainless steel kitchen hood flanked by black windows mounted above gray shaker cabinets accented with satin nickel pulls and gray granite counters located on either side of a stainless steel oven range placed on oak wood floors.
The patterns of the tile start to create a bolder aesthetic for your renovation.
I do love the slight contrast but would have been happy with white white too.
Contrast grey grout with white tiles looks wonderful especially if you decided to use subway tiles in your shower area.
The best part about white subway tiles is that if you want to keep the look classic you can simply use a matching grout.
Even with a simple subway tile pattern going dark with your grout will.
When using white tile with dark grout when you use dark grout the grout becomes the focus of the tile.
But before you name it the best solution for your bathroom thinks about a different approach.
Had i been able to do white with white i would have loved the look you chose.
I had wanted white cabinets with white subway tile but my cabinets ended up having a yellow undertone so i went with a light gray subway tile and yes the grout decision took a while but ultimately i matched the grout with the tile for a seamless look.
I semi remodeled my kitchen with long white subway tile and mid dark grey grout and i love.
Many people prefer using white grout with white tiles to make the walls look flawless and united.