One design element that most gardeners forget about is scent in the garden. Why would waste space on just a plan old holly bush when you can have a wonderful foundation planting of sweet gardenias. My favorite varieties are 'Mystery' which has the big flower and 'August Beauty' which has smaller flowers but is a tougher plant.
But don't forget about the fragrant Star Jasmine. This plant is semi-bush and semi-vine. Great ground cover or trellis plant, the Star Jasmine is so easy to grow. Full sun to semi-shade is what it prefers.
Both gardenias and jasmines require good drainage. Don't forget to fertilize after they both bloom and prune back after they flower.