I'd do a mirror with a wooden frame , stained as close as you can to the basin drawers ( even if you have to have to 'go over' the drawers again ) . I'd get it made to within 50mm the size of the 'square' that you have left .

It then looks like it is all planned , and a nice simple or even complex frame will avert your eyes to a certain degree .

the other comment I would make it that as the small mosaics are 5 or 6 tones , it will actually hide some of the randomness and make it look a feature . Embrace it , in other words .

Tricky one. How about a black framed cabinet mirror with timber shelves alongside which match your vanity. Put a hanging plant on the left to detract from the mosaic edge. Install a beautiful black wall light which hangs slightly down over the mirror to draw the eye.

Here’s pics showing an eg of the cabinetry and a visual mock up. Good luck and please keep us posted.

Another idea, cheaper and easier. Use flat mirror rather than cabinet, black frame. Instead of timber shelf unit it will be open still matching vanity ie. flat panel backing board with one shelf on top third for a hanging plant, hang a towel hook matching the light on the lower third. I think it would work best covering up the mosaic border on the left. Could mock up in a photo later if it helps.

I like option pictures above with the mirror centered over tap with open shelves to left . It looks really resolved

Oh and both should be same depth.

Here is the second option. Just a board with a shelf. The board will need to have good side edges ie. same trim. The towel holder was the best pic I could find. A circle one would work better imo. Also my mirror is a bit wonky. Sorry.

I agree with bigreader. The mosaics just don't look correct, even if they were in line with the basin. are you replacing the vanity as well. the benchtop doesn't seem to go with anything else. Or maybe it's just the colouring on my computer?

the mosaics make the room look too busy.

great suggestions by @Mandy

I'm one of those people where it's either got to be symmetrical or designed asymmetrical. This is neither, its just a giant lack of awareness about where the grout lines where going to end up and an appaling idea of what a centre line looks like. That cabinet jammed into the corner with it's lip on 2 sides isn't helping.

• Get rid of the countertop lip. I don't know why it is there since many bathroom cabinets do just fine sitting up against wall tiles. It's only accentuating the fact your cabinet is jammed into the corner and making the space look cramped.
• I honestly don't think there is any way to rescue the mosaic edging since you can't get away from the fact that the two horizontal grout lines that cross it do so at uneven points in the design and that it's not centred with the cabinet. I honestly would require the tiler to take it all down and replace that section with your plain tile.
• Failing that I would cover the entire thing with a large plain mirror. Make sure that mirror goes right to the corner and then out to cover the mosaic on the other side. But it still won't be centred with the cabinet. Don't accept shoddy work, require the replacement you will hate yourself if you don't.

Get a flat mirror the width of the vanity and tall enough to cover all the unsightly mosaics, then buy or build a compact but tall, open shelf unit to sit on the left hand side to cover the mosaics on that side.