We are thinking about tiling the walls in our separate toilet .. plain white tiles ( 300x600) same as the bathroom which is next to it. Planning to just tile the back wall , ie the wall behind the toilet which has a window above the toilet . Same tile as the skirting tile and paint the walls. Out tiler thinks it will look like we “ ran out of tiles” if we don’t tile the whole room . I think it would possibly be like a cold cell .. what do u think ?