Gorgeous home, Terri! A tough and pretty perennial I would highly recommend is Liriope muscari, especially the non-variegated cultivars. The cultivar 'Big Blue' is especially pretty, with taller, darker flowers. It is low to the ground, evergreen, and produces lovely purple flowers in August. It is happy in sun or shade and is drought-resistant. It might be nice interspersed with other plants such as the ones suggested by Amanda and Betsy.
