Hello, sorry for the delayed response - the shower floor is just a typical pebble tile that is sold on 12" x 12" sheets. In this case the pebbles are very flat on the top so it is not a bumpy floor at all. One word of advice is to match the color of the grout to the tile - with the amount of gaps between the pebbles it may not be best to highlight this amount of grout - I prefer to hide this. Best of luck to you!