Maybe you could get a small piece of stone and have it cut? That's what the one below appears to be.

[Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Vancouver Tile, Stone & Countertops World Mosaic (BC) Ltd.

I would stick with the floor tiles you already have in the bathroom. Maybe bring the tiles up to meet the bottom of the medicine cabinet/mirror if you have enough. Just another added bit of color and chance to use those beautiful tiles. NancyLouise

Hi Lotterticket, thanks, oh that does look nice, I'll show it to DH, I posted on my blog and others said the same thing as you suggest.

Hi Nancylouise, thanks, I'm afraid if I add too much more dark tile the room will be too dark looking and we have some large tiles left, but no small tiles

here's a photo of the shower which is slightly darker than the floor

I would either fix the drywall, or maybe you could get a piece of marble cut in an arch shape to cover the damage, and that would run the length of the sink.

Try going to your local hardware store and have them cut you a piece of plexiglass. You might have to slightly modify the piece especially if the sink has a bow to it.Pick up some nice polished screws with matching rounded washers, screw it in and problem solved!

I would just fix the drywall behind the sink & paint it, or use the floor tile & come up behind the sink & toilet about 4' or so.

I like vertical glass, turned sideways and take it up to the ceiling...or white stone.

I think I'd tile the entire wall behind the pedestal sink; from floor to ceiling and the full width of that wall. Anything else will end up looking odd.