what Paint colour?

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Help! Need to paint the new bathroom tomorrow!
We will be having dark grey tiles on one wall, light grey tiles on floor and 2 walls. White countertop with dark grey basin.
What colour shall I paint the fourth wall??
Suggestions please. Am notoriously bad with decor!!

Teal? Blue and blue/green goes nice with grey :)

thank you. do you think a strong bold shade or a more pastel type shade?

I think bold shade. An electric blue would be lovely.

White ??