I made a large entry two days ago and with the Blogger trouble, it got wiped out. Anyway, here is some more plants that look good precisely because of their striking foliage. Aren't the leopard spotted leaves of this calla attractive? The flowers it makes are just an added bonus.
Here is a better picture of the glamorous Bengal Tiger canna leaf. You can clearly see the red outline around the perimeter of the leaf and the striking stripes. This plant makes a terrific statement in a tropicalesque bed.
I'm not overly fond of the ubiquitous elephant ear - at least the common ones you see everywhere down here. They will easily take over an area and start looking "ratty." However, there are some cultivars of colocasia that are fabulous. This one is called Black Ruffles. The leaves get to be a deep purple color as they age. Another great specimen for the tropical bed.
And if the above plants don't make a big enough statement, I present to you the Thailand Giant colocasia. This plant will make leaves over five feet long and over 3 feet wide! You must keep it well watered and fertilized for that type of performance though.
If you want something a little less bold and demanding, then nothing beats a good old-fashioned fern. This is one I recently planted in a shady area on the foundation of my house. Doesn't it look lush? Foliage plants add so much to flower beds if you need to have a more full look. Don't neglect to add some of these beauties to your gardens.