Lush bath bomb if you want to change the colour of the water. Make sure you crumble it under running hot water though to avoid any lumps!
I like mud masks but it depends on your skin type. My auntie swears by separating an egg and painting the white on her face (washing off after ten mins) and using the yolk to condition her hair. Might be a bit of a faff though. Plus I always wondered if you need to use cold water for rinsing to avoid scrambled egg hair?
Glass of wine and a good book or magazine would be near the top of my list too.