Don't use the wall faucet variety, UNLESS you want to purchase a new top for the vanity. Or return the vanity. Pretty simple. The round hole was meant to have a faucet. Not a "cover" which may also allow water down under, which may also ruin the vanity as there will be no containing water lines beneath the little hole. Bad idea,

The mosaics behind the vanity are called extra light diamond from Rex. I have added the website http://www.rex-cerart.it/en/extra-light/ The tiler will screed the wall in white so no other colour comes through and then use an adhesive in white and then grout. I have sealed the grout also as white grout can discolour. You will see on the website some amazing applications of this little glass mosaic. Happy hunting

Have you tried looking through the Houzz professional's tag or asking the people who have posted the photos that you've seen where they got their cabinet from?

Can anyone tell me best height for tiles on vanity to use as a back splash I’m using 3 mirrors above I was going to drop mirrors to vanity but don’t like the look