I like to mass plant azalea and include a variety of colors to make a cool looking show from a distance. Drift Roses, rhododendron, and mountain laurel are also mass planting favs of mine. Hardy Gardenia Azalea flowers look a lot like Gardenia flowers.
Be sure to use a well drained soil medium when planting any Azalea, Rhododendron, Mountain Laurel, or Camellia as they all prefer fall planting with less watering than you might think. In NC our soil is clay so we prefer to use pine bark soil conditioner when planting these varities.