I'm in the process of having a pool built. I'm doing noche travertine coping and decking. This will a freeform pool with a 18" raised spa and 12" raised wall along the back. I'm having a hard time deciding what type of stone to use on the sides and spillway of the spa and the raised wall. I was considering doing chopped lueders in a random pattern. I want to go with stone and not tile. Any suggestions?