Crochet - Granny Spike Stitch - leaves fewer gaps, because the second double crochet is crochet through the top of the second double crochet of the row below. Possibly use a dc,tc, dc pattern in the clusters? From Do It Darling.
I like the big tiles, not keen on the small tiles in this picture, beige is warming. Awesome Shower Tile Ideas Make Perfect Bathroom Designs Always : Minimalist Bathroom Metalic Head Shower Small Flower Vase Shower Tile Ideas by jsanu.