Rex is a great name for a dinosaur, but it'd also a fantastic variety of Begonia. These Begonias are sometimes called 'painted leaf', or 'fancy leaf' Begonias, and looking at the patterns and colours available it's easy to see why.
Notes
Likes humidity, but doesn't like direct misting. Place on a pebble tray to increase humidity.
Had to grab this one as the pastel green was so pretty. There is a water resivour at the bottom to stop plants sitting in water so its perfect for orchids but at the moment I'm using it for another plant.