Incorporate the stone used within and around your home into your pool design - this tumbled silver ash travertine look amazing - http://www.sareenstone.com.au/products/travertine-tiles/silver-ash-travertine-unfilled-honed-227
Here is another Shipping Container Pool and smartly done. Love how they added a shelf so you can sit in shallow water to cool off and making climbing out easier plus they added a shallow probably tiled end. Looks like two containers end to end. Works for a small yard.