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.
Teloxys aristata also called "Sea Foam" or "Zeechium" is a particularly attractive annual plant for lovers of dry bouquets, architects and designers. Indeed, its stems are used for reproducing miniature trees.