We have buff coloured marble in our bathroom and although I love it I wouldn't put it with a black and white floor. I think it you are selling as well then it would probably be best to keep the tiles neutral. Someone mentioned fushia, and I would love fushia in my downstairs bathroom (when it ever gets fitted) but don't think I would risk it if selling, it's not everyone's cup of tea.
Haven't been able to look at any of the links, think I've managed to pick up a bug on my PC.