A couple weeks ago I posted a hole in the bathroom wall on Instagram.  Here again is before and after photos. To do this you have to make sure you don’t have pipes or any other structural elements.
Then make a wooden box, make box waterproof and finally add tiles.  I added wooden shelf because it works better with my bathroom furniture which I plan to waterproof with proxy.   Brackets are form amazon for $10 here is the link. These tiles are very cheap, and I already had some scrap wood and waterproof materials so the whole project costed me $16.