After searching through endless accent tile options and balancing style with budget, I found a fabulous mini brick marble mosaic at Home Depot. I used in as a border and in the inset. To add a little more dimension to the border, I sandwiched it with two bands of white beveled subway tiles.
Another element I used in the master bath to elevate it a little was marble sill found in the flooring department at Lowe's. I used it as baseboard, to cap the shower curb and to cap the narrow ledge I designed to run the length of one of the shower walls.