Went in for an hour today to give everywhere a final coat of sealer.
Was hoping it would look better now grouted. Slate looks okay but I would have gone with a darker grout, but that floor!!
Customer agrees he made a mistake with the floor but he'll have to live with it.
Hopefully when I've done with final fix it will look better.
As you say, he chose them so he'll have to live with them! I just do what I'm asked to do, I only advise clients if something they want done won't be functional not that I don't like the colour or design of something.