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.
Ptilotus exaltus var. exaltatus (also Pink Mulla Mulla) is one of the largest mulla mullas. This ephemeral in a good season grows to 1.5m tall, though in poor years it may be only a few cm tall. There is a basal rosette of spathulate-oblanceolate smooth leaves up to 10 cm long, the stem leaves being shorter.