Encaustic tiles are incredibly popular right now.
You will find them on walls, as I’ve applied them in this Upper West side kitchen, or on floors.
Edited from Wiki: The use of the word “encaustic” to describe an inlaid tile of two or more colors is linguistically incorrect. The word encaustic from Ancient Greek means “burning in”. The term originally described a process of painting with a beeswax based paint that was then fixed with heat. The term did not come into use when describing tile until the nineteenth century. Supposedly, Victorians thought that the two color tiles strongly resembled enamel work and called them encaustic. Despite the error, the term has now been in common use for so long that it is an accepted name for inlaid tilework.