Tiles: ceramic, stone, porcelain or glass?

Here are some shots of the tile that we will use on floors in "wet" rooms and showers, etc. We will use slate and terrazzo for flooring. We will use terrazzo and porcelain for the shower walls. One shower floor will use the round stones that look pretty cool (different?) and feel fine underfoot. The fleur-de-lis made of medal and will go on the tub enclosure for Dani and Deb's bath in random spacing. The small square pieces are glass tiles and will go in the master shower enclosure as an accent