Slipper Satin, Stoney Ground or shaded white are the recommended complimentary colours but if you really want a grey you could try strong white. I've got French Gray Units which isn't a million miles away from Mizzle and I've used Dulux Egyptian Cotton on the walls, it's definitely grey (although doesn't look it on colour chart) but got a beige undertone so would work with your flooring.

Painting the walls the off white in the tile would allow the other features of the room to stand out.

What color of paint for walls in bathroom that had gray tiles

Hi,I am completing a bathroom reno and looking for ideas of colours to go on the walls.I have a Stiffkey blue vanity with Charcoal Laura Ashley floor tiles and Mahon Gris wall tiles to 90cm high. So im looking to paint a above these wall tiles which are a light grey colour.Advice greatly appreciated,Fin