Where are the tiles going and why concrete you need to explain the issue a bit better and also some of thactual house renderings with no info are useless.

The tile is going on the pool around water line. The stone is going on pool, Bbq and fireplace. Coping and deck around pool will be concrete as well as bbq counter.

I think they all look great with the silver travertine.

@nicolehild, your backyard plan looks great! Concrete color can be tricky, here's a picture of our concrete decking. Davis color in Pewter, which would look good with silver travertine. (The coping is by SUI in Grey Mist.)

The Davis concrete color Pebble would also work with the tan tones in your travertine sample.

Feel free to reach out directly with questions.