Synthetic fabric stiffened with PVA. A bit wobbly and very plasticy. Wouldn't be my fabric of choice.
Cotton. The firmest of all the fabrics.
Silk. The lightest of all the fabrics. Good results all round. Shiny one side, matt the other. The silk picked up an amazing amount of detail. You can see the embossed writing from the bottom of the lemon tray on this one. And yes, the whirlies so whirl when you blow on them.
At least I have something to take to the planning meeting tomorrow. Feel a bit better prepared now.