The island top was a mistake. Why the icy white? It is VERY difficult to be in two palettes, warm and cool, simultaneously. Possible "fixes"? a tile that allows a mix of both warm and col tones. Feeling newer than subway, a five by five ceramic, Bedrosians below IIN OTHER WORDS, MAKE THE LITTLE GOOF, LOOK VERY INTENTIONAL. : )
https://www.bedrosians.com/en/product/detail/cloe-tile/?itemNo=DECCLOWHI55G
OR..........
Do the island top over. Consider a light butcher block, a quartz in a pale gray or softer white. I wouldn't tile any splash, until resolved. : ) Or paint the island to a perimeter cabinet match, and repeat your perimeter counter top. Or paint it a color and add a wood top....
The top was a goof, ( it happens) and best is to free yourself for a soft white tile, toned to the soft white of the perimeter cabinets.
Q