I love waterlilies, but they have been painted so much that it's hard to not be a cliche'. I've noticed that Florida artists paint Birds of Paradise, Crotons, and water birds so much that it is hard to stand out in the crowd. That's why I enjoyed painting my Dragonflower a while back.
I have a plant that is so unique and weird that I won't even try to paint it. It's a Starflower cactus and it is beige and fuzzy. I call it my Alien Flower because it is very other-worldly.