I'm late to the party, but here's a couple of a Nightblooming Cereus that was outside my front door a couple weeks ago... shot with a 5D and my 85 f/1.8
Wow! Some great stuff here. Mine is not quite in the same league -- got the DOF a bit too shallow, but the statue in the background is the outdoor Thinker in the Rodin museum in Paris, along with the Eiffel Tower.