What Houzz contributors are saying:
For a clean, continuous look, use the same material on the floor and shower pan. This floor expanse is only broken up by the curb. Tip: Shower floor tiles should be no larger than 6" x 6", and 4" x 4" or smaller is recommended. There are two reasons for this: One is so there are enough grout lines underfoot to provide traction for slip resistance. The other is that you need small tiles to cover a sloping floor.