Good old Etsy! Never know what you are going to find.
I came across elementclaystudio.etsy.com and OMG, how adorable! They are "simple" white square ceramic tiles, but the design and texture are unbelievably cool.
You can display cluster different designs of the same size or you can buy multiples of one tile and create some serious wall decor.
5” Square Micro Tiles, $200, etsy.com
9” Square Magnolia Tile, $250, etsy.com
9” Square Barnacle, Textured Tile, $250, etsy.com