Light colour tiles ordered appear so much darker when installed in windowless bathroom. How can I make it all look/feel lights, its sooo brown looking!(Finally could add images)

This is the tile

Hi got new limestone stone tiles for utility room 15mm but hallway outside has already been laid and they're 10mm laid at 15mm height. I hate the look of them door divider/trim things is there any solution. Such a shame I got the thicker tile after the otges were laid. I'm meeting tiler next week can't ask him as he's on hols. Coukd yi shave down the ones closest to the point the tiles meet. Also re another can you get a thick underlay to rise laminate flooring to meet a 15mm tile?

We are renovating our bathroom and I have picked a light blue and white tiles to go in there, the tiles come in 30cm x 60 rectangular blocks. I am looking for advice on the best way to layout these tiles on the wall. The height of the room means if laid vertically you will have approx 4.5 tiles.