barely buff or whole wheat by Sherwin Williams? I just put Barely Buff in my small bathroom and LOVE it but used the next shade up - whole wheat - in a small guest room and it looks phenomenal there... so depends upon the size of your room, but this looks small so perhaps the Barely Buff will be great. If the colors are more grey, you may want to look at Grey Wisp by Benjamin Moore. Check out those two...

Go for full tiles

highlight tiles are really not in fashion. it was 5 - 10 years back. i would suggest go with the bottom less distracting simple design throughout. carry dark floor tiles up 3 inches on the wall as skirting. ensure the centre line of your shower fixture and its wall controls lie in the centre of the tiles. that would be your starting point. rest will fall in place. ideally the ceiling height should not be more than 8 feet. if its more you end up with an uneasy proportion. either do gypsum false ceiling at 8 feet or stop the tiles at about that height and paint the rest of the wall in dark grey or purple and have pendant light that throw light below 8 feet. good luck.

These are some of the colors that I liked.