For gorgeous containers, try the Thriller/Spiller/Filler method.
An ideal container plant plan includes a “thriller,” – a tall plant with a strong form and colorful foliage. Place it at the back of the pot. Next are the “fillers,” – plants which will help hide the soil line, and finally the “spillers,” – plants which will spill out over the pot’s edge, adding more movement and color. In the end, there is a three-dimensional composition that looks beautiful.