Green is a wonderful colour to use in the bathroom design. 

In order to make it a bit more special and graphical, green square tiles could be used both fitted standard way or diagonally. 

Picture source: Inrichting Huis

To put an accent on lines and shapes a contrast colour grouting could be used. 

Picture source: Techne

White tiles with green grouting will look simple but with a nice kick. 

Picture source: Dezeen

Painting wall in green outside wet areas and combining with other graphical tiles in white in black could create quite of a statement.

Picture source: Archdaily

Picture source: Arkpad