We used Polished Pebble Tile Mesh Backed Sheet in Black Pearl on shower floor and coordinating Polished Pebble Border Tile for the accent lane on the shower enclosure wall. To make everything perfect you will need to adjust the shape of the tiles a little bit (around the drain, in the corners etc.) I recommend to use hot glue gun and extra pieces of mesh (drywall mesh would work). Grout will do the rest! In our project it was charcoal non-sanded grout.
cool tiles is just that, cool!! we put this pebble tile in our walkin shower floor and it is awesome, everyone that comes over comments on how cool it is, we love it.