Right, for these mosaics the fragments that make up the mosaic are cut by hand, each one is different. What are now called mosaic tiles will give a very different result because they make a square grid, more like pixel art. Although there’s historical precedent here too, for instance in square kufic calligraphy!

It’s not uncommon though to see mosaic floors in pre-war European homes, especially in entrance halls, but they tend to be designs specific to the space. After all, copying an existing design requires the same floor dimensions.

In Sevilla, there’s actually a palace where the owner changed the dimensions of the rooms to fit the roman mosaics (originals) they had installed https://visitasevilla.es/en/museum-fine-arts-and-other-place...

New mosaics are rare because labour is more expensive, but for sure they still get made. EDT I’ve always figured that it’d be something fun to commission for new buildings because, old as the medium is, you still have the basic elements of colour and form that should allow contemporary artists to express themselves.

for example here’s a recent mosaic in England by Grayson Pery https://static.dezeen.com/uploads/2015/05/A-House-for-Essex_... part of https://www.dezeen.com/2015/05/15/house-for-essex-fat-grayso...

or a Belgian atelier making traditional mosaic floors http://www.mosaicodidue.be/vloeren-nieuw/