I spent an hour or two playing about with posing a couple of my aircraft models on some grass mat. I used the Canon PowerShot G9 for simplicity, though I did set it to manual, smallest aperture and macro.
Sadly, the mat is a quite fluorescent under light in the workshop, and despite setting the camera’s white balance to match it all looked too bright. I wasted a bit of time faffing in Aperture to try and balance things, but ended up converting to greyscale. To get a bit more of a period feel, I could add some grain, but I’m reasonably happy with the results.