I would take a look at SW Useful Gray and SW Analytical Gray. Both are beautiful variations of greige with slight green undertones. Another option you might like is SW Stone Lion. The online swatch looks nothing like it does in person (at least on my computer). I painted our first floor Stone Lion and it looks fantastic with our dark olive/sage green accent color. The color changes based on lighting from a warm beige to more grey. It also appears to have a green undertone. Also, my plan is to paint our two story foyer/landing Worldly Gray as a transition color from the Stone Lion.

I would suggest a pastel aqua colour for walls such as Benjamin Moore's 'Morning Sky Blue' and keep the the cabinetry and trim in a cool white tone such B.M. 'Dove White'. Other suggestions to update your bathroom for a relatively low cost is replacing the pulls on the cabinets and perhaps new light fixture above the mirror.

As far as the door hardware on the vanity cabinet I would suggest checking out Anthropologie's or Restoration Hardware selection they have a diverse range of styles and materials to choose from.