Coffea Arabica is easy to grow indoors, makes a very attractive houseplant and if it likes you well enough, it will even rewards you with flowers and berries!
Grow your own Coffee, will take approx 4 years for first harvest. It is actually very easy to grow, indoors. This is surely worth a try for something different.
The Dwarf Cavendish Banana makes a good container specimen if given careful attention. Banana plants are extremely decorative, ranking next to palm trees for the tropical feeling they lend to the landscape.