The croton (Codiaeum variegatum) has colorful foliage and nearly limitless leaf forms. Sold in 2" pot.
 
They do have a drawback—they're difficult to please indoors. In their native habitats, crotons like humid, warm conditions with dappled light and plentiful water. The problem indoors is typically temperature—when it is too cold, they start losing leaves. However, crotons are well worth the effort because a well-grown croton is an explosion of color. 
 
Light: Crotons need bright, indirect light. They do not like unfiltered, direct sunlight, but thrive in dappled sunlight. Vibrant colors depend on bright light.
Water: Keep them evenly moist in the summer and reduce watering in the winter to biweekly. Mist frequently during the growth period.
Temperature: Keep the room above 60 F and do not expose to cold drafts.
Soil: A well-drained potting soil is perfect.
Fertilizer: Apply slow-release pellets or liquid fertilizer during the growing season.