We have white tiled half walls, the tiles are a long brick shape, and navy paint (Hague Blue) above the tiles.
I know there is a fashion for coloured tiles right now but a few years ago people thought of coloured tiles as dated and 1970s. In a few more years they may well be out of fashion again and either you or a future buyer may hate them. It’s a lot easier to change paint in future than tiles.
Also would recommend large tiles in the shower as small tiles equals more grout and more mildew.