There are a lot of charcoal and black tiles on the market. You shouldn't have any trouble finding something you like. Then, if you locate a glass tile with the colors of your vessel sink, it would make a nice accent tile. I'd advise looking at Oceanside Glass for the glass tile. They can custom mix any of their colors for you.

what are u mounting the vessel bowl on? more black tiles?

If you can't find something in that colour range that you like, I'd recommend having the rest of the room light and bright and having your vessel bowl the star with its contrasting bold coloration. You might find that with all that tile matching the sink, the sink loses its emphasis.

Hi, I think if you just pick one of the strong colors and use it on the tiles and shower curtains it will make the entire bathroom flow better.