Caladiums are tropical perennials that have almost unparalleled foliage and make showy houseplants. They have large, arrow-shaped and paper-thin leaves that come in a striking array of colors and patterns. A mass of caladium is an explosion of whites, greens, reds, and pinks that are mottled, veined, and striped. They can easily give you the visual impact of flowers while only being foliage plants. However, these plants have a few drawbacks. They are tuberous plants that grow foliage only from spring to autumn. They also require very high humidity, and they have absolutely no cold tolerance. Nevertheless, as far as unusual indoor plants go, these are sure to catraise a few admiring eyebrows.