In a short LD I had, I created objects by turning 180, stating the item I wanted, and turning around.

Example:

I wanted an apple. I turned around and said "There's an apple behind me!" When I looked back there was a rotten apple on the ground.

I wanted a moonbelt to fly with. "I want a moonbelt that will let me fly, and it's behind me right now." Again, it was there, but not exactly how I imagined it. Instead of just a white belt-ish thing, it was white with a joystick. At this point the lucidity stopped and my subconsious took over again.

I think this method works, but not all the time. Is there a different way to get things I want? Or do I just have to really imagine it? And can I create objects in plain view?